Conidia hi-res stock photography and images - Page 22

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 40. Cucumber Diseases. a. Mosaic, b. angular leaf spot (after Smith and Bryan), r. individual germs of Pseudotnonas lachrymans, d. downy mildew (Manns), e. conidiophore and conidia of Plasmopara cubensis, f. germinated conidia and swarm spore, g. germinated swarm spores {e. to g. after Clinton), h. anthracnose.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original wo Stock Photo

RMRCCKCE–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 40. Cucumber Diseases. a. Mosaic, b. angular leaf spot (after Smith and Bryan), r. individual germs of Pseudotnonas lachrymans, d. downy mildew (Manns), e. conidiophore and conidia of Plasmopara cubensis, f. germinated conidia and swarm spore, g. germinated swarm spores {e. to g. after Clinton), h. anthracnose.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original wo

$. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 21; ASCOMYCETES. abjoiiited (Fig. 103); in the interior of the spots are produced tiny conidia {Lcptostroma laricinum), incapable of germination.. Fig. 101.—Tuft of larch needles, the greater number of which are more or less attacked by Sphaerella laricina. (After R. Hartig.) The rod-shaped conidia infect particularly the lower needles of the crown, and three weeks thereafter new conidial cushions M^ T^ff^. Please not Stock Photo$

RMRCC3ND–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 21; ASCOMYCETES. abjoiiited (Fig. 103); in the interior of the spots are produced tiny conidia {Lcptostroma laricinum), incapable of germination.. Fig. 101.—Tuft of larch needles, the greater number of which are more or less attacked by Sphaerella laricina. (After R. Hartig.) The rod-shaped conidia infect particularly the lower needles of the crown, and three weeks thereafter new conidial cushions M^ T^ff^. Please not

. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. HYSTEROGRAPHIUM. 233 Eostrup ^ regards it as a parasite on Fra.cinus. Twigs of the ash attacked show Hat collapsed plates of bark, on which are developed pycnidia containing one-celled conidia, and, later, the apothecia. On young twigs the diseased part often extends round the whole circumference, and causes the death of the upper living part. As yet I have only found tliis fungus as a saprophy Stock Photo

RMRCC323–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. HYSTEROGRAPHIUM. 233 Eostrup ^ regards it as a parasite on Fra.cinus. Twigs of the ash attacked show Hat collapsed plates of bark, on which are developed pycnidia containing one-celled conidia, and, later, the apothecia. On young twigs the diseased part often extends round the whole circumference, and causes the death of the upper living part. As yet I have only found tliis fungus as a saprophy

. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. TUBERCULINA. 32T Tuberculina. Mycelium parasitic on hyphae and spore-patches of Uredinme. Short rod-like hyphae spring from the spore-patches, and give off' from their apices, globose conidia, which on germination produce branched promycelia bearing sickle-shaped conidia.. Fio. 179.—Schinzia cyptricola on Cyperus flavescens. Several roots show palmately- divided swellings. Isolated spore. (After Magnus.) Tuberculina p Stock Photo

RMRCC3FF–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. TUBERCULINA. 32T Tuberculina. Mycelium parasitic on hyphae and spore-patches of Uredinme. Short rod-like hyphae spring from the spore-patches, and give off' from their apices, globose conidia, which on germination produce branched promycelia bearing sickle-shaped conidia.. Fio. 179.—Schinzia cyptricola on Cyperus flavescens. Several roots show palmately- divided swellings. Isolated spore. (After Magnus.) Tuberculina p

RMRCC3GK–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 296 U.STILAGINEAE.. Fn, 162. - celia, may develop to inycelia; coalescence of coiiidia is unknown. In nutritive solutions conidia are formed in large numbers, and multiply yeast-like till nutriment fails. Ust. succisae Magn.^ frequents the anthers of Scabiosa Succisa, and forms pure white spores, easily distinguished from those of the two preceding species. The anthers appear to be thickly covered with glassy granules

RMRCC3XR–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fig. 31.âCi/Ktopus caHdiihtn. B, Conidiophores isolated from the cushion ; the conidia or sporangia are united by intermediate cells. C, Sporangia breaking up to form swarm-spores. D, Swarm-spores escaping, is', Swarm-spores in motile condition. /â ', Swarm-spores come to rest and germinating. G, Two germ-tubes entering a stoma of Lepidium sativum; the stoma is shown from the inside, so that the spores from which the

RMRCC3B0–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. COLLETOTRICHUM. 487 api)ear on the leaves, and depressions on the stem, sometimes extending so far round that the whole shoot dries up. The conidial patches are very much the same on the different hosts, and consist of short conidiophores from which oval, unicellular, hyaline conidia are abjointed. C. lycopersici Cliei^r. is lUe cause of a spot-disease on the fruit of tomato in the United States. C. spinaciae Ell. et.

RMRCC2H1–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. COLLETOTRICllLM. 487 appear on the leaves, and dt-pressions on the stem, sometimes extending so far round that the wlmlc shoot dries up. The conidial patches are very nnich the same nw tlie diflfrcnt liosts, and consist of short conidiophores from whicli oval, unicellular, hyaline conidia are alijointnl. C. lycopersici ('hest. is the cause nf a spot-disease on the fruit of tomato in the Unit.'d

RMRCD6F5–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. PLASMOPARA. 129 the Vine. This parasite was introduced into Europe from America.^ It makes its appearance in early summer as white patches on the under surfaces of leaves, sometimes also on stalks and fruit. In the course of the summer the leaves show brown spots and dry up. The white patches consist of tufts of branched conidiophores, from which ovoid conidia are abiointed. These on germina-. FiG. iO.—PlasmoiMi-a vit

RMRCC3GF–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. SPHACELOTHECA. .305 period, and produce three-celled promycelia with elongated ovoid conidia, which sprout indefinitely. In nutritive solutions two or three promycelia may l)e produced. Schizonella.^ The spores are produced in series on the reproductive hyphae. At first two-chambered by means of a cross-septum, they later separate into two loosely-joined cells and form twin-spores; each half germinates like an Ustilag

RMRCC315–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. SCLEKUTINIA. 1.'t7 leaves of Vaccinium Vitls-Idara exbiliit in spring a mould- like coating, consisting of chains of lemcju-shaped conidia. Woronin thus describes it: " In the outer layers of the cortex, amongst the dying elements, a pseudoparenehymatous cushion is formed, from which simple or dichotomously branched hyphae grow out through the overlying cuticle. The individual members of t

RMRCC3T8–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fici. 6'i.—Ej:o((scv.s aurevs. Leaf section from the margin of a swelling, showing normal and hypertrophied tissue. The cells of the swelling are alniomially elongated with thickened walls, and some show secondary cell-division. The bases of the asci are wedged in between the cells; one ascus is shown with conidia. (v. Tubeiif del.) Exoascus cameus Johan. occurs on leaves of Betula o'loralu, B. ndua, and B. intermedia

. Diseases of truck crops and their control. Vegetables. Fig. 41. Squash Diseases. a. Showing squash blossoms invaded by the fungus Choanophora cucurbitarum, b. squash entirely rotted by the Choanophora fungus, c. young conidiophore of Choanophora with ramuli developing on the primary vesicle, d. mature capitulum covered with a layer of conidia, e. conidia, /. sporangia and columella, g. sporangio spores with tufts of hair-like appendages, h. mature zygospore («, c. to /;. after Wolf), i. Pusarium wilt of young squash plants,./. Rhizopus rot.. Please note that these images are extracted from s Stock Photo

RMRCCKEP–. Diseases of truck crops and their control. Vegetables. Fig. 41. Squash Diseases. a. Showing squash blossoms invaded by the fungus Choanophora cucurbitarum, b. squash entirely rotted by the Choanophora fungus, c. young conidiophore of Choanophora with ramuli developing on the primary vesicle, d. mature capitulum covered with a layer of conidia, e. conidia, /. sporangia and columella, g. sporangio spores with tufts of hair-like appendages, h. mature zygospore («, c. to /;. after Wolf), i. Pusarium wilt of young squash plants,./. Rhizopus rot.. Please note that these images are extracted from s

$. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. PESTALOZZINA. 495 Pestalozzina Soraueriana Sacc.^ occurs on foxtail grass {Alopecurus pratcnds). The conidial tufts develop on spots which appear on the gradually withering leaves. The bristle-appendages on the terminal cell of the conidia are lateral, only one being terminal. This disease was first observed by Weinzierl at Vienna,. Fig. 305.—Sfptogloeum Bartif/kmum on Acer carivptstre. The dead twigs exhibit black po Stock Photo$

RMRCC3H5–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. PESTALOZZINA. 495 Pestalozzina Soraueriana Sacc.^ occurs on foxtail grass {Alopecurus pratcnds). The conidial tufts develop on spots which appear on the gradually withering leaves. The bristle-appendages on the terminal cell of the conidia are lateral, only one being terminal. This disease was first observed by Weinzierl at Vienna,. Fig. 305.—Sfptogloeum Bartif/kmum on Acer carivptstre. The dead twigs exhibit black po

. Elements of ecology. Ecology. The Critical Environment 7 of pollen that a yellowish dust is often deposited on all surfaces in the vicinity. A tropical American orchid of the genus Maxillaria is re- ported to produce as many as 1,756,000 seeds per capsule. Spores are produced in astronomical numbers by many lower plants. A conserv- ative estimate made for the downy mildew, Sclerospora, which attacks maize in the Philippines, indicates that as many as 6 billion conidia (spores) are liberated from the fungi parasitizing a single maize plant during one night. Since discharge of conidia continue Stock Photo

RMRCM707–. Elements of ecology. Ecology. The Critical Environment 7 of pollen that a yellowish dust is often deposited on all surfaces in the vicinity. A tropical American orchid of the genus Maxillaria is re- ported to produce as many as 1,756,000 seeds per capsule. Spores are produced in astronomical numbers by many lower plants. A conserv- ative estimate made for the downy mildew, Sclerospora, which attacks maize in the Philippines, indicates that as many as 6 billion conidia (spores) are liberated from the fungi parasitizing a single maize plant during one night. Since discharge of conidia continue

RMRCD6D2–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fio. 77.âNectria ciaiu'.bariiw., with peri- tliucia on the dead bark of a still-living stem of Elm. Infection has evidently begun at the wound of a cut branch near the middle, and extended outwards, (v. Tubeuf phot.) Fig. 78.âXectrUi ciivaalMnno.. Portion of branch (magnified). Light-coloured cushions of conidiophores with conidia are breaking out towards the upper end, and colonies of hard red perithecia towards the

RMRCC3XW–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 124 I'HYCOMYCKTES. is very frequent on wild and cultivated Cruciferae throughout the wliole world, and causes deformation of shoot, leaf, and tiower.. Fig. 31.âCi/Ktopus caHdiihtn. B, Conidiophores isolated from the cushion ; the conidia or sporangia are united by intermediate cells. C, Sporangia breaking up to form swarm-spores. D, Swarm-spores escaping, is', Swarm-spores in motile condition. /â ', Swarm-spores come

RMRCC349–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. NECTRIA. 185 Nectria. Perithecia yellow or red in colour, and generally produced in close tufts on stromata of the same colour. The asci con- tain eight bicellular spores and few or no paraphyses. Conidia of various kinds and shapes are also produced. Nectrina cinnabarina Fr.^ (Britain and U.S. America). The bright-red, button-sliaped conidial cushions of this fungus may. Please note that these

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 484 DISEASES OF CULTIVATED PLANTS Begin spraying when the leaves are expanding, and repeat at intervals, using self-boiled lime and sulphur compound. Bordeaux mixture cannot be used, as it scorches peach leaves even when much diluted. Pierce and Galloway, Journ. Mycol.. Yr,. 145.—Ccrcospora chrumicissa. i, diseased pcacli leaf; 2, tuft iif conidia, highly niaj:;. Cucumber and melon leaf blotch.— This destructive pest was first observed in 1.S06, and for Stock Photo

RMRCDR3T–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 484 DISEASES OF CULTIVATED PLANTS Begin spraying when the leaves are expanding, and repeat at intervals, using self-boiled lime and sulphur compound. Bordeaux mixture cannot be used, as it scorches peach leaves even when much diluted. Pierce and Galloway, Journ. Mycol.. Yr,. 145.—Ccrcospora chrumicissa. i, diseased pcacli leaf; 2, tuft iif conidia, highly niaj:;. Cucumber and melon leaf blotch.— This destructive pest was first observed in 1.S06, and for

RMRCC330–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. Fic. 101.—Tuft of larch needles, the greater number of which are more or less attacked by SphaereUa laricina. (After R. Hartig.) The rod-shaped conidia infect particularly the lower needles of the crown, and three weeks thereafter new conidial cushions. Fig. 102.—Sphaerella lancina. Section throngli a diseased spot on a larch needle. The interior of the leaf is permeated with the intercellular

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. MACROSPORIUM 503 or with the apex somewhat narrowed, variously muriformly septate, 80-120 X 15-22 /x. Chlamydospores formed in the decaying substance of diseased portions of the host, very irregular in form and size, dark brown, either interstitial or terminal, sometimes in chains. Pycnidia often crowded, appearing along with or after the conidia; globose, black, with a small mouth, containing numerous minute, hyaline, elliptical conidia, about 3 x 2 /x. Stock Photo

RMRCDR2T–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. MACROSPORIUM 503 or with the apex somewhat narrowed, variously muriformly septate, 80-120 X 15-22 /x. Chlamydospores formed in the decaying substance of diseased portions of the host, very irregular in form and size, dark brown, either interstitial or terminal, sometimes in chains. Pycnidia often crowded, appearing along with or after the conidia; globose, black, with a small mouth, containing numerous minute, hyaline, elliptical conidia, about 3 x 2 /x.

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 28. Sweet Potato Diseases. a. and /. Chains of conidia of the soil stain fungus MonilochcEtes infuscans, b. to /. manner in which the chains of conidia of M. infuscans are breaking up into individual spores, o. germinating conidia of M. infuscans, n. part of a cross section of a sweet potato root showing the relationship of M. infuscans to the epidermis of the host, p. conidiophores of Trichoderma Koningi, a, young strands of mycelium of Phymatolrichum omnivorum, r. mycelial strands of the Texas root rot fungus, Ozonium omni Stock Photo

RMRCCKDX–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 28. Sweet Potato Diseases. a. and /. Chains of conidia of the soil stain fungus MonilochcEtes infuscans, b. to /. manner in which the chains of conidia of M. infuscans are breaking up into individual spores, o. germinating conidia of M. infuscans, n. part of a cross section of a sweet potato root showing the relationship of M. infuscans to the epidermis of the host, p. conidiophores of Trichoderma Koningi, a, young strands of mycelium of Phymatolrichum omnivorum, r. mycelial strands of the Texas root rot fungus, Ozonium omni

$. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. PESTALOZZINA. 495 Pestalozzina Soraueriana Sacc.^ occurs on foxtail grass {Alopccuri's jn'tid/ish^). The conidial tufts develop on spots which appear on the gradually withering leaves. The bristle-appendages on the terminal cell of the conidia are lateral, only one being terminal. This disease was first observed by Weinzierl at Menna,. Fig. Z05.—S(pto{iloeum Hartigianum on Actr cnmpeslre. The dead twigs exhibit black Stock Photo$

RMRCC3AP–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. PESTALOZZINA. 495 Pestalozzina Soraueriana Sacc.^ occurs on foxtail grass {Alopccuri's jn'tid/ish^). The conidial tufts develop on spots which appear on the gradually withering leaves. The bristle-appendages on the terminal cell of the conidia are lateral, only one being terminal. This disease was first observed by Weinzierl at Menna,. Fig. Z05.—S(pto{iloeum Hartigianum on Actr cnmpeslre. The dead twigs exhibit black

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 41. Squash Diseases. a. Showing squash blossoms invaded by the fungus Choanophora ciicurbitarum, b. squash entirely rotted by the Choanophora fungus, c. young conidiophore of Choanophora with ramuli developing on the primary vesicle, d. mature capitulum covered with a layer of conidia, e. conidia, /. sporangia and columella, g. sporangio spores with tufts of hair-like appendages, h. mature zygospore («, c. to /;. after Wolf), i. Fusarium wilt of young squash plants, .;'. Rhizopus rot.. Please note that these images are extra Stock Photo

RMRCCKCB–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 41. Squash Diseases. a. Showing squash blossoms invaded by the fungus Choanophora ciicurbitarum, b. squash entirely rotted by the Choanophora fungus, c. young conidiophore of Choanophora with ramuli developing on the primary vesicle, d. mature capitulum covered with a layer of conidia, e. conidia, /. sporangia and columella, g. sporangio spores with tufts of hair-like appendages, h. mature zygospore («, c. to /;. after Wolf), i. Fusarium wilt of young squash plants, .;'. Rhizopus rot.. Please note that these images are extra

RMRCC3AG–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 504 FUNGI IMPKRFECTI. Mastigosporium. Conidia hyaline and four-celled, frequently bristled. Mastigosporium album Riess. produces oblong dark spots with light margins on leaves of living grass. The conidia are produced on the margins of the spots (Fig. 308). Fusoma. Similar to Fusarium, but the mycelium is loose and not aggregated into a tuft. Conidia spindle-shaped and septate.. Fig. 300.—Fusoma parasiticum. Dis- ease

RMRCC2GA–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. 504 FUNGI IMPERFECT!. Mastig-osporiura. Conidia hyaline and four-celled, frequently bristled. Mastigosporium album Eiess. produces oblong dark spots with light margins on leaves of living grass. The conidia are produced on the margins of the spots {Fig. 308). Fusoma. Similar to Fusarium, l)ut the mycelium is loose and not Conidia spindle-shaped and septate. aggregated into a tuft. Fig. 309.—Fus

RMRCC3HH–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. COLLETOTRICHUM. 487 appear on the leaves, and depressions on the stem, sometimes extending so far round that the whole shoot dries up. The conidial patches are very much the same on the different hosts, and consist of short conidiophores from which oval, unicellular, hyaline conidia are abjointed. 0. lycopersici Chest, is the cause of a spot-disease orx the fruit of tomato in the United States. C. spinaciae Ell. et. H

RMRCC33X–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. 192 ASCOMYCETKS. coats of the ovary, till gradually but completely it tills up the whole cavity. Outside the ovary the mycelium forms an. L I'ln-purea. Err/ot. Sckrotia or Ergot-grains in ears of Rye. (v.^Tubouf phot.) irregular wrinkled white stroma or sphacelia, from the hollows and folds of which little ovoid conidia are abjointed from short. Please note that these images are extracted from

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. PYTHIUM 105 Bud-rot of palms.—During the past few years a peculiar disease attacking palms in the Godavari delta, India, has been investigated by Dr. Butler, Imperial Mycologist, Re-. FiG. 22,.—Pythium de baryanum. i, seedlings of cress [Le- pidizim sativutn) attacked by the fungus ; 2, mycelium bearing conidia at the tips of the branches ; 3, sporangia in different stages, also a free zoospore ; 4, an oosphere with the antheridium or male organ, which h Stock Photo

RMRCD9D5–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. PYTHIUM 105 Bud-rot of palms.—During the past few years a peculiar disease attacking palms in the Godavari delta, India, has been investigated by Dr. Butler, Imperial Mycologist, Re-. FiG. 22,.—Pythium de baryanum. i, seedlings of cress [Le- pidizim sativutn) attacked by the fungus ; 2, mycelium bearing conidia at the tips of the branches ; 3, sporangia in different stages, also a free zoospore ; 4, an oosphere with the antheridium or male organ, which h

RMRCC3AK–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fig. 30C—MoHilia fructigena more or less concentric lines, attack, (v. Tubeuf del.) A, Apple showing the grey conidial patches as S, Young Peach, slnivelled up in consequence of next spring, when the fruit is again moist, further conidia are given off'. Infection takes place by wounds or even through the epidermis of young leaves and blossoms. The conidia have. Please note that these images are extracted from scanned

RMRCC314–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. 258 ASCOMYCETES. conidia germinate and give off' long septate hyphae which, follow- ing the course of the pollen-tube, reach the ovary, and soon fill all four loculi with a w^hite mycelium. The growth of this mycelium proceeds from the central axis towards the walls, and forms a hollow sphere open above and below. The diseased berries cannot be distinguished till ripe; then, whereas the normal

RMRCD6DT–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Flu. 63.—Exoascus aureus. Leaf section from the margiu of a swelling, showing normal and hypertrophied tissue. The cells of the swelling are abnormally elongated with thickened walls, and some show secondary cell-division. The bases of the asei are wedged in between the cells; one ascus is shown with conidia. (v. Tubeuf del.) Exoascus cameus Johan. occurs on leaves of Brtv.la odorata, B. nana, and B. intermedia. The p

RMRCC3XB–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. PLASMOPARA. 129 the Vine. This parasite was introduced into Europe from America.^ It makes its appearance in early summer as white patches on the under surfaces of leaves, sometimes also on stalks and fruit. In the course of the summer the leaves show brown spots and dry up. The white patches consist of tufts of branched conidiophores, from which ovoid conidia are abjointed. These on germina-. Fio. iO.—Plasmo2>a.ra

RMRCD6AR–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. HYSTEROGRAPHIUM. 233 Eostriip ^ regards it as a parasite on Fraxinus. Twigs of the ash attacked show flat collapsed plates of bark, on which are developed pycnidia containing one-celled conidia, and, later, the apothecia. On young twigs the diseased part often extends round the whole circumference, and causes the death of the upper living part. As yet I have only found this fungus as a saprophyte. HYPODERMIEAE. Hypode

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. Fig. 4S.—Nec/ria solatii, figures illustrating its life-cycle, i, portion of a diseased tuber, and section through a conidial stroma ; 2, Monosporium fruit ; 3, conidia of same germinating ; 4, Fumrium stage, following the Mono^porium condition ; 5, Fusarium conidia, germinating and producing the Cephalosporiztin ?,ia.ge ; 6, stroma that has pro- duced Monosporium and Fusarhim conidia, bearing young perithecia, or the commence- ment of the ascigerous con Stock Photo

RMRCD97N–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. Fig. 4S.—Nec/ria solatii, figures illustrating its life-cycle, i, portion of a diseased tuber, and section through a conidial stroma ; 2, Monosporium fruit ; 3, conidia of same germinating ; 4, Fumrium stage, following the Mono^porium condition ; 5, Fusarium conidia, germinating and producing the Cephalosporiztin ?,ia.ge ; 6, stroma that has pro- duced Monosporium and Fusarhim conidia, bearing young perithecia, or the commence- ment of the ascigerous con

. Distinguishing characteristics of some forage-grass diseases prevalent in the North Central states. Forage plants Diseases and pests Middle West; Grasses Diseases and pests Middle West. CHARACTERISTICS OF SOME FORAGE-GRASS DISEASES Brown Spot Brown spot, caused by Pyrenophora (Helmin- thosjwrium) bromi (Died.) Drechsl., is a fungus disease that attacks smooth bromegrass. Initial symptoms appear as small, dark spots on the first blades formed early in spring. As lesions enlarge, a yellow halo forms around each spot (fig. 6). Severely infected leaves yellow and wither. Conidia of the fungus de Stock Photo

RMRCCHCW–. Distinguishing characteristics of some forage-grass diseases prevalent in the North Central states. Forage plants Diseases and pests Middle West; Grasses Diseases and pests Middle West. CHARACTERISTICS OF SOME FORAGE-GRASS DISEASES Brown Spot Brown spot, caused by Pyrenophora (Helmin- thosjwrium) bromi (Died.) Drechsl., is a fungus disease that attacks smooth bromegrass. Initial symptoms appear as small, dark spots on the first blades formed early in spring. As lesions enlarge, a yellow halo forms around each spot (fig. 6). Severely infected leaves yellow and wither. Conidia of the fungus de

RMRCC3MN–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. EXOBASIDIUM. 425 from each a spindle-shaped spore is abjointed (Fig. 257). The liasidiospores divide in water by formation of cross-septa, and a germ-tube arises from each terminal cell. On a young leaf of Vaccinium the germ-tube penetrates and gives rise to a mycelium (Fig. 258) ; on other substrata the germ-tube sprouts into several very fine sterigmata, from the extremi- ties of which a series of conidia are abjoin

RMRCCHD1–. Distinguishing characteristics of some forage-grass diseases prevalent in the North Central states. Forage plants Diseases and pests Middle West; Grasses Diseases and pests Middle West. CHARACTERISTICS OF SOME FORAGE-GRASS DISEASES Leaf Spot The leaf spot disease caused by Helmintho- sporium vagans Drechsl., occurs only on bluegrass. Initial infections appear as chlor- otic specks on the blades. These rapidly develop into ovate, straw-colored lesions with reddish margins (fig. 4). A single lesion may cover the entire width of a blade, and severely infected leaves wither and die. Conidia of t

RMRCC30K–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. SCI.EROTINIA WITH ISOTRYTIS-COXIDIA. 269 Sclerotia, along with ^'o/'/vy/'/.s-conidia, have been found fre- quently on diseased geraniums. During the summer of 1894 a withering of twigs of Pruims triloba occurred in several gardens at Munich (Fig. 141). A mycelium was found in the bark, leaf-petioles, and young ovaries, while Botrytis-Qon^^ were developed on the dead parts. AVith these I succ

RMRCD6B0–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. ff;tst)5-*«*»*»« (k.-'''-^* Fio. 112.—Section of stroma of ^e'?nos7?om. a, Boundary of stroma formed of dark brown fungu.s-mycelium; h, sclerenchyma-strand of the cortex ; c, conidial cushion ; rf, union of necks of two perithecia. (After Hartig.). Fig. 113.—n, Conidia; 6, asco- spore of Agki.ospora toJ.eola ( X ^^). (After Hartig.) superficially abjointed from the stromata; while embedded in it are groups of perithec

RMRCD6BH–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Hartig gives the following interesting facts on its distribution. ,, , , , 111 • 1 • 1 Fig. 103.—«, Rod-shaped As already remarked, the perithecia de- comdia before and after , . ,1 n 1^ ^ ^ -l^ detachment from the velop in spring on the lallen larch needles, basidia. b, Micro-conidia -, . , , . IT,- ,1 ^ from the interior of the and in low-lying localities the spores reach cushions, x ^i". (After maturity at the

. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. Fig. 127 Gnomonia Iliau, Vertical Section of Perithecium and Asci From Bull. 11, Dept. Pathology, H.S.P.A.. Fig. 128 Melanconium Iliau. Stromata and Conidia From Bull, it, Dept. Pathology, H.S.Pji.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Nowell, William, 1880-; West Indies (British). Imperial Dept. of Agriculture. London, West India Stock Photo

RMRCD914–. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. Fig. 127 Gnomonia Iliau, Vertical Section of Perithecium and Asci From Bull. 11, Dept. Pathology, H.S.P.A.. Fig. 128 Melanconium Iliau. Stromata and Conidia From Bull, it, Dept. Pathology, H.S.Pji.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Nowell, William, 1880-; West Indies (British). Imperial Dept. of Agriculture. London, West India

RMRCC334–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. 208 ASCOMYCETES. will be found changing from yellow to black on account of the periderm and dead stroma becoming darker. On dead branches the large cushions of fructifications will be found to include: (a) perithecia with a warty exterior and pores set in a depression; (b) large pycnidia, standing out from the cushions, with brown smooth coats, and full of compound multiseptate conidia (Fig. 99

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 54. Onion Diseases. a. Downy mildew, 6. mature conidiophore and conidia of Peronospora schleideni, c. fertilization of the female oogonium by the male antheridium, d. oospore (a. to d. after Wh2tzel), e. onion smut, /. spore ball of the smut fungus, g. spore germina- tion, formation of sporidia at x, h. Vermicularia anthracnose, i. section through acervulis of Vermicularia circinans, j. setas and spore formation in 1-'. circinans {e. to g., i. and i. after Thaxter), k. pink root of onion, healthy and diseased bulbs, /. pink Stock Photo

RMRCCKAG–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 54. Onion Diseases. a. Downy mildew, 6. mature conidiophore and conidia of Peronospora schleideni, c. fertilization of the female oogonium by the male antheridium, d. oospore (a. to d. after Wh2tzel), e. onion smut, /. spore ball of the smut fungus, g. spore germina- tion, formation of sporidia at x, h. Vermicularia anthracnose, i. section through acervulis of Vermicularia circinans, j. setas and spore formation in 1-'. circinans {e. to g., i. and i. after Thaxter), k. pink root of onion, healthy and diseased bulbs, /. pink

RMRCC2Y9–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. TUBERCULIN A. 32; Tuberculina, Mycelium parasitic on hyphae and spore-patches of UreiUncae. Short rod-Hke liyphae spring from the spore-patches, and give off from their apices, globose conidia, wiiich on germination produce branched promycelia bearing sickle-shaped ciuiidia.. Fui. 1V9.âSchinzia ryjxricola on Cyperat rtnveaeens. Scvoriil routs nliow pvliuutoly- divided HwelliiiKH. Ixolated s|ior

. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES OF BANANA 253 described as penetrating the tissue of the rootstock, and these in turn give out hyphae which grow among the cells. The fructifications are borne at or just above ground level.. Fig. 98 SpHAEROSTILBE MUSARUM, CONIDIA, ASCUS AND ASCOSPORES Bull. 6, Dept. Agri., Jamaica The conidial stage occurs on small yellow or orange cushions up to 2 mm. diameter, bearing one or more slender white stalks furnished with a brown or brownish red spherical head or ending in a point.. Please note that these i Stock Photo

RMRCD95B–. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES OF BANANA 253 described as penetrating the tissue of the rootstock, and these in turn give out hyphae which grow among the cells. The fructifications are borne at or just above ground level.. Fig. 98 SpHAEROSTILBE MUSARUM, CONIDIA, ASCUS AND ASCOSPORES Bull. 6, Dept. Agri., Jamaica The conidial stage occurs on small yellow or orange cushions up to 2 mm. diameter, bearing one or more slender white stalks furnished with a brown or brownish red spherical head or ending in a point.. Please note that these i

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 6i. Potato Diseases. a. Black wart (after Gussow), b. late blight on foliage, c. late blight on tuber, d. successive stages of the development of the conidia of Phyiophthora infestans (b. and d. after L. R. Jones), e. germination of conidia of Phytophlhora infestayis, bv means of zoopores (after Ward),/, mature oogonium of P. infestans (after Clinton)'. R. melters. surface view, early stage of infection, h. pycnidium of Phoma tuberose (after Melhus and Rosenbaum).. Please note that these images are extracted from scanned pag Stock Photo

RMRCCKA8–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 6i. Potato Diseases. a. Black wart (after Gussow), b. late blight on foliage, c. late blight on tuber, d. successive stages of the development of the conidia of Phyiophthora infestans (b. and d. after L. R. Jones), e. germination of conidia of Phytophlhora infestayis, bv means of zoopores (after Ward),/, mature oogonium of P. infestans (after Clinton)'. R. melters. surface view, early stage of infection, h. pycnidium of Phoma tuberose (after Melhus and Rosenbaum).. Please note that these images are extracted from scanned pag

RMRCC3H9–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 284 USTILAGINEAE. tbrination of conidia ensues; the conidia multiply in a yeast- like manner, and only grow out as hyphae on exhaustion of nutritive material. Infection takes place on seedling-plants. Kiihn cultivated this species on Borghimi saccharatum and S. vulgare., and suggests that a common disease of Durra in South Africa may be caused by this parasite. Ust. sorg-hi (Link.) {Ust. Tulasnci Kiihn) (U.S. America)

RMRCC3PX–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. <m-^-t. Fio. Sl.—Kectriu .^^-..; i aiikeron H;izcl. ' place of infection, a partially broken branch-fork. Fio. so.—.Vtcfivc i'i7;.<.,;,„... ('anker ou a stem of Beech, (v. Tubeuf phot.) produced. The mycelium at first gives off tiny unicellular conidia on the bark, then later white cushions bearing fine conidiophores, from which are abjointed multicellular conidia, shaped like a sickle. Infection is brought abou

RMRCD6FA–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fio. 34.—Ci/Atopus canditli'n. B, Conidiophores isolated from the cushion ; the conidia or spomiigia are united by intermediate cells. C, Sporangia breaking up to form swarm-spores. D, Swarm-sporos escaping. E, Swarm-spores in motile condition. F, Swarm-spores come to re.st and germinating. 0, Two germ-tubes entering a stoma of Lcpidiuni scUivam; the stoma is shown from the inside, so that the spores from which the ge

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. Fig 66—Koselhiiia iiciatnx. i, poiiion of root of apple-tree with whue fleecy mycelium, 2, biown hyphae with swelHngs; 3, loot with sderotia beating conidial fruit; 4, single cluster of conidiophoies; 5, branch of last beating conidia; 6, stylospores produced in pycnidia (after Viala) ; 7, perithecium surrounded by conidiophores (after Viala) ; 8, ascospores; 9, a sycamore infected witli thi^ fungus, the portion above ground enveloped in white my- celium Stock Photo

RMRCD94A–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. Fig 66—Koselhiiia iiciatnx. i, poiiion of root of apple-tree with whue fleecy mycelium, 2, biown hyphae with swelHngs; 3, loot with sderotia beating conidial fruit; 4, single cluster of conidiophoies; 5, branch of last beating conidia; 6, stylospores produced in pycnidia (after Viala) ; 7, perithecium surrounded by conidiophores (after Viala) ; 8, ascospores; 9, a sycamore infected witli thi^ fungus, the portion above ground enveloped in white my- celium

RMRCC3NE–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fkj. 90.—Cucurhitaria labv.rni. A, Stroma witli pycnidia containing minute unicellular conidia. B, One of the large smooth pycnidia. (After v. Tubeuf.) The mature perithecia have a peridium consisting of a loose pseudoparenchyma with a rough warty exterior and a pore set in a distinct depression (Fig. 100.) The paraphyses are long, strong threads, often branched, and between them arise the long cylindrical asci with r

RMRCD63K–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. CLADOSPOIUIM. '11 CI. Scribneriamum Cav. ()ii leaves of Betxda popuUfolia in America and Italy. CI. hypophyllum Fiiek. On leaves of Clmai rampcstris. CI. tuberum Cooke. lu the tubei-s of Batatas edulU in Carolina, U.S.A. 3. Sect. Phragmosi'ur.e. 1. Sifbsect. Micronerivac. Clasterosporium. Conidia brownish, cyliiidriciil or spindle-shaped, and consisting of three or four cells. Clasterosporium

RMRCC34M–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. Fi(i. d'i.—Ejousms aurevs. Leaf section from the mar^ii of a swelling, showing normal and hvpertrophied tissue. The cells of the swelling are abnonnally elong-dted with thickened walls, and some show secondary cell-division. The bases of the asci are wedged in between the cells; one ascus is shown with conidia. (v. Tubeuf del.) Exoascus carneus -lohan. occurs on leaves of Bdula odorata, JJ. n(i

RMRCC3W8–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 158 ASCOMYCETES. contain only conidia, whereas those on Alnus-incana are said by Sadebeck to contain only ascospores, unless on very rare occasions. In the lower and higher Alps, although both species of alder are not infrequently found together, yet the Exoasms is found only on Alnus incana, and no species occurs on A. glvtinosa.. Fig. b'i.—Exoasoia alni-incanae in catkins of Alnus incana. Many of the scales arc deve

RMRCD6EE–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 158 ASCOMYCETES. contain only conidia, whereas those on Alnvs-incana are said by Sadebeck to contain only ascospores, unless on very rare occasions. In the lower and higher Alps, although both species of alder are not infrequently found together, yet the Rvoascus is found only on Alniis incana, and no species occurs on A. glutinosa.. Fig. 53.—Exoascus abii-incanae in catkins of Alnus incana. Many of the scales are dev

RMRCC2YN–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. 312 USTILAGINEAE. germination produce a thread-like promycelium bearing apical conidia, wliicli conjugate in pairs before emerging from the host-tissues. The following species form conidia on the host-plant: Entyloma serotinum Schroet. occurs on leaves of Symphytum tuberosum, S. officinalis, and Bora(jo officinalis. E. canescens Schroet. On Myosotis (Britain). E. fuscum .Schroet. On Papaver Rho

RMRCC3G9–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 312 USTILAGINEAE. gerraiiiatioii produce a thread-like promyceliuni bearing apical conidia, which conjugate in pairs before emerging from the host-tissues. The following species form conidia on the host-plant: Entyloma serotinum Schroet. occurs on leaves of Sympltytum tnherosurii, S. officiitalix, and /lor'/f/o ojficijuih'.s. E. canescens Schroet. On Myosotis (Britain). E. fuscum Schroet. On Fapaver Rhoeas and /'. Arg

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. SCLEROTINIA 261 vine directly. Istvanffi has written a very detailed account, profusely illustrated, of the vine sclerotinia.. Fig. ^-j.—Sclerotinia fuckeliana. i, vine leaf with Botrytis form of fungus ; 2, conidiophores of Botrytis ; 3, a head or cluster of conidia ; 4, sclerotia bearing Botrytis form of fruit ; 5, asclerotium bearing two ascophores ; 6, like fig. 5, on a larger scale ; 7, a shrivelled grape with sclerotia ; 8, ascus with spores. All e Stock Photo

RMRCD92M–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. SCLEROTINIA 261 vine directly. Istvanffi has written a very detailed account, profusely illustrated, of the vine sclerotinia.. Fig. ^-j.—Sclerotinia fuckeliana. i, vine leaf with Botrytis form of fungus ; 2, conidiophores of Botrytis ; 3, a head or cluster of conidia ; 4, sclerotia bearing Botrytis form of fruit ; 5, asclerotium bearing two ascophores ; 6, like fig. 5, on a larger scale ; 7, a shrivelled grape with sclerotia ; 8, ascus with spores. All e

RMRCD6CY–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fig. 80.—Nectria ditissinia. Canker on a stem of Beech, (v. Tubeuf phot.). Fig. 81.—Nectria ditissima. Canker on Huzel. The l^lace of infection, a partially broken branch-fork. produced. The mycelium at first gives off* tiny unicellular conidia on the bark, then later white cushions bearing fine conidiophores, from which are abjointed multicellular conidia, shaped like a sickle. Infection is brought about by the germi

RMRCD685–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 284 USTILAGINEAE. formation of conidia ensues; the conidia multiply in a yeast- like manner, and only grow out as hyphae on exhaustion of nutritive material. Infection takes place on seedling-plants. Kiihn oiltivated this species on Sorgimm saccharatum and S. vulgare, and suggests that a common disease of Durra in South Africa may be caused by this parasite. Ust. sorghi (Link.) {UsI. Tulasnei Kiihn) (U.S. America). Th

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. PHOMA 409 Phoma solani (Halsted) causes a 'damping off' of egg- plants. The disease attacks the seedHngs at the base of the stem, the fruit of the fungus appearing as exceedingly minute dots on the diseased part. Halsted, New Jersey Agric. Exp. Sta. Rep., 1891.. Fig. 127.—Phoma sanguinolenta. i, diseased carrot; 2, diseased carrot flowering stem ; 3, portion of a diseased spot showing perithecia with the conidia escaping as a viscid tendril ; 4, section Stock Photo

RMRCD8MW–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. PHOMA 409 Phoma solani (Halsted) causes a 'damping off' of egg- plants. The disease attacks the seedHngs at the base of the stem, the fruit of the fungus appearing as exceedingly minute dots on the diseased part. Halsted, New Jersey Agric. Exp. Sta. Rep., 1891.. Fig. 127.—Phoma sanguinolenta. i, diseased carrot; 2, diseased carrot flowering stem ; 3, portion of a diseased spot showing perithecia with the conidia escaping as a viscid tendril ; 4, section

$. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. this fungus is injurious to Fisuin mticurn, Fhasroh's rii/;/riris, Vicia sativa,eXc. It causes spots on leaves and ])()ds, fnllcjwed l)y (Iryinci up of the former and deformation uf the kilter. The p}'cnitlia appear as tiny ])oints on the spots, and y;ive out hicellular cyhmhical conidia. As. Boltshauseri Sacc.^ This species was tirst observed in Switzerland on bean {Fha- seolus vulgaris). Leav Stock Photo$

RMRCC2H4–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. this fungus is injurious to Fisuin mticurn, Fhasroh's rii/;/riris, Vicia sativa,eXc. It causes spots on leaves and ])()ds, fnllcjwed l)y (Iryinci up of the former and deformation uf the kilter. The p}'cnitlia appear as tiny ])oints on the spots, and y;ive out hicellular cyhmhical conidia. As. Boltshauseri Sacc.^ This species was tirst observed in Switzerland on bean {Fha- seolus vulgaris). Leav

RMRCC3YB–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 312 USTILAGINEAE. germination produce a thread-like promycelium bearing apical conidia, which conjugate in ])n'n-H before emerging from the host-tissues. The following species form conidia on the host-plant: Entyloma serotinum Sohroet. occurs on leaves of Symphytum hiherosum, S. ojici/tafis, and Borago officinalis. E. canescens Schroet. On Myoaotis (Britain). E. fuscum Schroet. On Papaver Rhoeas and /'. Argemone. E. b

RMRCC328–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. Fig. 112.—Section of stroma oi Aglaospora. a, Boundary of stroma formed of dark brown fungus - mycelium; 6, sclerenchyma-strand of the cortex ; c, conidial cushion ; d, union of necks of two perithecia. (After Hartig.). Fig. 113.—a, Conidia ; h, asco- spore of Aglaospora toJ.eolo. ( X -^f^). (After Hartig.) superficially abjointed from the stromata; while embedded in it are groups of perithecia

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 436 DISEASES OF CULTIVATED PLANTS spots are more or less circular, and surrounded by a well- developed, blackish border, hence the American name of bird's-eye rot. When the fungus produces fruit on the diseased spots they are greyish in colour, due to the masses of conidia present. There are generally several diseased. 5L> KiG. 135. —r;A'(('j/();7//w ampi-h>plui i^iii)i. i, appearance of disease on stem, leaves, and tendrils of vine ; 2, diseased g Stock Photo

RMRCD8K8–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 436 DISEASES OF CULTIVATED PLANTS spots are more or less circular, and surrounded by a well- developed, blackish border, hence the American name of bird's-eye rot. When the fungus produces fruit on the diseased spots they are greyish in colour, due to the masses of conidia present. There are generally several diseased. 5L> KiG. 135. —r;A'(('j/();7//w ampi-h>plui i^iii)i. i, appearance of disease on stem, leaves, and tendrils of vine ; 2, diseased g

RMRCC3X1–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 134 niYrOMVCKTES, and l.tranehed coiiidinphores with light-lirown conidia arise from their underside. Numerous oospores may be found in the leaves. Kirchner ^ observed the disease on leaves of four-year-old plants, yet without injurious effects. The following are other British or American species: Peronospora ficariae, Tiil. On Ranvnculus, Mi/osnrns, etc. P. corydalis, De By. On Corydalis and Dicentra. P. violae, De B

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 62. Potato Diseases. a. Early blight (after L. R. Jonej). 6. spores of the early blight fungus, c. silver scurf, d. conidiophores and conidia of the silver scurf fungus, e. and /. Fttsarium oxysporum wilt in tubers, g. chlamydospores and one to several celled conidia of F. nxysponim. h. conidiophores of F. oxysporum (g. and /;. after Sherbakoff), i. Ver- ticillium wilt (after Orton).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap Stock Photo

RMRCCKA7–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 62. Potato Diseases. a. Early blight (after L. R. Jonej). 6. spores of the early blight fungus, c. silver scurf, d. conidiophores and conidia of the silver scurf fungus, e. and /. Fttsarium oxysporum wilt in tubers, g. chlamydospores and one to several celled conidia of F. nxysponim. h. conidiophores of F. oxysporum (g. and /;. after Sherbakoff), i. Ver- ticillium wilt (after Orton).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap

. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES CAUSED BY FUNGI 39 which develop a small number of conidia (sporidia), regarded as equivalent to basidiospores. In the Tilletiaceae the sporidia. Fig. 9 BASIDIOMYCETES 1. SCHIZOPHYLLUM CoMMUNE. 2. CyATHUS MiCROSPORUS. 3. Thelephora. 4. Craterellus. 5. Lycoperdon. 6. Lachnocladium. 7. Fomes. 8. Marasmius. 4, 5, 6, 8 after Nat. Pflanz are elongated and frequently join by a small cross filament to make pairs.. Please note that these images are extracted from scanned page images that may have been digitally Stock Photo

RMRCD9M9–. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES CAUSED BY FUNGI 39 which develop a small number of conidia (sporidia), regarded as equivalent to basidiospores. In the Tilletiaceae the sporidia. Fig. 9 BASIDIOMYCETES 1. SCHIZOPHYLLUM CoMMUNE. 2. CyATHUS MiCROSPORUS. 3. Thelephora. 4. Craterellus. 5. Lycoperdon. 6. Lachnocladium. 7. Fomes. 8. Marasmius. 4, 5, 6, 8 after Nat. Pflanz are elongated and frequently join by a small cross filament to make pairs.. Please note that these images are extracted from scanned page images that may have been digitally

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 64. Tomato Diseases. a. Various stages of mosaic on foliage, b. c. blossom end rot, d. downy mildew, Phytophlhora infestans, e. conidia of buck-eye rot Phylophthora terrestris, f. conidia of P. terrestris. germinating Viy means of zoospores, g. zoospores, h. mature oospores cf P. terrestris, i. Ijuck-eye rot (p. to /. after §h-erbakoff).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfect Stock Photo

RMRCCKA2–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 64. Tomato Diseases. a. Various stages of mosaic on foliage, b. c. blossom end rot, d. downy mildew, Phytophlhora infestans, e. conidia of buck-eye rot Phylophthora terrestris, f. conidia of P. terrestris. germinating Viy means of zoospores, g. zoospores, h. mature oospores cf P. terrestris, i. Ijuck-eye rot (p. to /. after §h-erbakoff).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfect

RMRCD6C0–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 208 ASCOMYCETES. will be fuuiul chaiijj;ui<^- from yellow to black on account of the peritlerni and dead stroma becoming darker. On dead branches the large cushions of fructifications will be found to include: (a) perithecia with a warty exterior and pores set in a depression; (b) large pycnidia, standing out from the cushions, with brown smooth coats, and full of compound multiseptate conidia (Fig. 99, b; see belo

RMRCC305–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. 284 USTILAGINEAE. formation of conidia ensues; the conidia multiply in a yeast- like manner, and only grow out as hypliae on exhaustion of nutritive material. Infection takes place on seedling-plants. Kiilin cultivated this species on SorgMim saccharatum and S. vulgare, and suggests that a common disease of Durra in South Africa may be caused by this parasite. Ust. sorghi (Link.) {list. Tidasne

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. I20 DISEASES OF CULTIVATED PLANTS liberated and dispersed throughout the house. Tendrils and parts of the flower behave in a similar manner when attacked. A^ffiiwJl?^ ---^T-^. Fig. 26.—Plasmopara viticola. i, under surface of a vine leaf showing white patches of mildew ; 2, group of conidiospores bearing numerous conidia ; 3, three conidia more highly mag.; 4, conidia containing zoospores, in b, two zoospores have escaped from the conidium ; 5, mature oo Stock Photo

RMRCD9CF–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. I20 DISEASES OF CULTIVATED PLANTS liberated and dispersed throughout the house. Tendrils and parts of the flower behave in a similar manner when attacked. A^ffiiwJl?^ ---^T-^. Fig. 26.—Plasmopara viticola. i, under surface of a vine leaf showing white patches of mildew ; 2, group of conidiospores bearing numerous conidia ; 3, three conidia more highly mag.; 4, conidia containing zoospores, in b, two zoospores have escaped from the conidium ; 5, mature oo

. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES OF SUGAR CANE 309 Causative Fungus. The disease is due to a very inconspicuous fungus, Cephalo- sporium Sacchari, Bull., of which the slender colourless hyphae penetrate all the tissues of the stem. In the hollow which forms in the centre of diseased canes the fungus collects in a white fluffy mass and there the hyphae bear on short, mostly simple branches, terminal heads of one-celled conidia, variable in size and shape. The fungus can live as a saprophyte on a variety of materials and probably occurs Stock Photo

RMRCD91N–. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES OF SUGAR CANE 309 Causative Fungus. The disease is due to a very inconspicuous fungus, Cephalo- sporium Sacchari, Bull., of which the slender colourless hyphae penetrate all the tissues of the stem. In the hollow which forms in the centre of diseased canes the fungus collects in a white fluffy mass and there the hyphae bear on short, mostly simple branches, terminal heads of one-celled conidia, variable in size and shape. The fungus can live as a saprophyte on a variety of materials and probably occurs

RMRCC2YP–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. Fio. 167.—TilUlUi liitici. A, Twu spores genninatcd in moist air; a short promycclimn is dcvcloiicJ, nuil Ix-'ars a crown of conidia (sporidia), sevcnil of wliich have fused in pairs. Fushion of conidi.i, gcrniination, and development of a secondary conidiiini, C, are also shown. S, Two spores gei-miuated in water with proniyeelia which elonjf-.ite till the water surface is re;iehed, where they

. Diseases of truck crops and their control. Vegetables. Fig. 62. Potato Diseases. a. Early blight (after L. R. Jonej), b. spores of the early blight fungus, c. silver scurf, d. conidiophores and conidia of the silver scurf fungus, e. and /. Fusarium oxysporum wilt in tubers, g. chlamydospores and one to several celled conidia of F. oxysporum, h. conidiophores of F. oxysporum {g. and h. after Sherbakoff), i. Ver- ticillium wilt (after Orton).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o Stock Photo

RMRCCKCC–. Diseases of truck crops and their control. Vegetables. Fig. 62. Potato Diseases. a. Early blight (after L. R. Jonej), b. spores of the early blight fungus, c. silver scurf, d. conidiophores and conidia of the silver scurf fungus, e. and /. Fusarium oxysporum wilt in tubers, g. chlamydospores and one to several celled conidia of F. oxysporum, h. conidiophores of F. oxysporum {g. and h. after Sherbakoff), i. Ver- ticillium wilt (after Orton).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. CYSTOPUS 131 germination, these fungi can only infect plants during the presence of a certain amount of moisture. All are parasites on plants. White rust of crucifers.—This fungus {Cystopus candidus,. Fig. 29.—Cyziopus candid us. i, fungus on shepherd's purse ; 2, conidial form of fruit; 3, oospore ; 4, Cystopus portulacae, conidia and oospores in various stages of development ; 5, Cystopus trogopogonis, on leaf of goat's- beard; 6, oospore of same. Figs Stock Photo

RMRCD9C0–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. CYSTOPUS 131 germination, these fungi can only infect plants during the presence of a certain amount of moisture. All are parasites on plants. White rust of crucifers.—This fungus {Cystopus candidus,. Fig. 29.—Cyziopus candid us. i, fungus on shepherd's purse ; 2, conidial form of fruit; 3, oospore ; 4, Cystopus portulacae, conidia and oospores in various stages of development ; 5, Cystopus trogopogonis, on leaf of goat's- beard; 6, oospore of same. Figs

RMRCC3NG–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 208 ASC'OMYCETES. will be found changing from yellow to black on account of the periderm and dead stroma becoming darker. On dead branches the large cushions of fructifications will be found to include: (a) perithecia with a warty exterior and pores set in a depression; (b) large pycnidia, standing out from the cushions, with brown smooth coats, and full of compound multiseptate conidia (Fig. 99, b; see below No. 3, a

RMRCC3R3–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fn;. n.—Nectria cinnabaruw., with pcri- thucia on the dead bark of a still-living stem of Elm. Infection lias evidently betciin at the wound of a cut branch near the middle, and extended outw.ards. (v. Tubeuf phot.) Kiii. S.—Neclria cimiaUirina. Portion of Ijraiich (magnified). Light-coloured cushions of conidiophores with conidia .are breaking out towards the upper end, and colonies of hard red perithecia towards th

. Diseases of glasshouse plants. Greenhouse plants; Plant diseases. DISEASES DUE TO FUNGI 65 fungi found on vegetation. The fertile hyphae stand up in dense grey, velvety tufts and masses, producing oval conidia or spores on branched heads. These conidia are extremely Hght, and, being carried long distances in strong air currents, provide a most efficient method of spreading the disease. Numerous hard, black sclerotia are produced on the plant, and being highly resistant to abnormal conditions enable the fungus to liibernate from one season to the next. Sources of Infec- tion.—The infection is Stock Photo

RMRCDKP6–. Diseases of glasshouse plants. Greenhouse plants; Plant diseases. DISEASES DUE TO FUNGI 65 fungi found on vegetation. The fertile hyphae stand up in dense grey, velvety tufts and masses, producing oval conidia or spores on branched heads. These conidia are extremely Hght, and, being carried long distances in strong air currents, provide a most efficient method of spreading the disease. Numerous hard, black sclerotia are produced on the plant, and being highly resistant to abnormal conditions enable the fungus to liibernate from one season to the next. Sources of Infec- tion.—The infection is

. Diseases of truck crops and their control. Vegetables. Fig. 6i. Potato Diseases. a. Black wart (after Giissow), b. late blight on foliage, c. late blight on tuber, d. successive stages of the development of the conidia of Phyiophlhora infeslans (b. and d. after L. R. Jones), e. germination of conidia of Phytophthora infestuns, by means of zoopores (after Ward),/, mature oogonium of P. infcstans (after Clinton), g. melters, surface view, early stage of infection, h. pycnidium of Phoina titberosa (after Melhus and Rosenbaum).. Please note that these images are extracted from scanned page image Stock Photo

RMRCCKCJ–. Diseases of truck crops and their control. Vegetables. Fig. 6i. Potato Diseases. a. Black wart (after Giissow), b. late blight on foliage, c. late blight on tuber, d. successive stages of the development of the conidia of Phyiophlhora infeslans (b. and d. after L. R. Jones), e. germination of conidia of Phytophthora infestuns, by means of zoopores (after Ward),/, mature oogonium of P. infcstans (after Clinton), g. melters, surface view, early stage of infection, h. pycnidium of Phoina titberosa (after Melhus and Rosenbaum).. Please note that these images are extracted from scanned page image

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 47. Bean Diseases. a. and b. Rust on leaf and pods, c. section through bean leaf showing bean rust, summer spores, d. section through bean leaf, showing bean rust, winter spores, e. anthracnose, /. section through bean seed, showing relation of anthracnose to the host (f. d. and /. after Whetzel), g. Cercospora leaf spot, h. Isariopsis griseola leaf spot, i. conidiophores and conidia of Isariopsis.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - co Stock Photo

RMRCCKBF–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 47. Bean Diseases. a. and b. Rust on leaf and pods, c. section through bean leaf showing bean rust, summer spores, d. section through bean leaf, showing bean rust, winter spores, e. anthracnose, /. section through bean seed, showing relation of anthracnose to the host (f. d. and /. after Whetzel), g. Cercospora leaf spot, h. Isariopsis griseola leaf spot, i. conidiophores and conidia of Isariopsis.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - co

RMRCC34B–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. a white coating over the whole leaf-surface of Acer platanoides. The conidia are spherical. U. circinata C. et Peck, is found on species of Acer in America. U. salicis ). C. (Britain and U.S. America). This species occurs on leaves of the willow, and produces white spots or thick coatings on one or both surfaces. It is also found on leaves of poplar and birch. U. prunastri D. C. on Fru7ius sjn

RMRCD6AB–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fig. 125.âLophodermium nerciseqv.ium. Section of a needle of Silver Fir. h, Pycnidium on upper surface shedding conidia. o, Apothe- cium on the lower surface. (After R. Hartig.). Fig. ]2i3.âLophodermium nervisequium on Silver Fir. Portion of a ripe apothe- cium. a a, Filamentous paraphyses ; rod-like cells (conidia?), k, ahjointed from the apex of the paraphyses; the asci contain eight spores about half as long as the

RMRCD6D7–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. a white coating over the whole leaf-surface of Acer 2ilcUanoides. The conidia are spherical. U. circinata C. et Peck, is found on species of Acer in America. U. salicis L). C. (Britain and U.S. America). This species occurs on leaves of the willow, and produces white spots or thick coatings on one or both surfaces. It is also found on leaves of poplar and birch. U. prunastri D. C. on Prmius spinosa (Britain). U. Bivon

. Downy mildew of tobacco. Tobacco blue mold; Tobacco. 72 Connecticut Experiment Station Bulletin 405. FiGUBE 5. The causa] fungus, Peronospora tabacina. A. A single spoorphore showing young summer spores in several stages of development. Most of the spores have already fallen off the tips of the branches. B. Mature summer spores (sporangia or conidia). C. Germination of the summer spores in var- ious stages from one to fom- hours in a drop of water. D. An oospore (winter spore) from the interior of a dead leaf. (Magnified, 400 times natural size.). Please note that these images are extracted Stock Photo

RMRCCBXP–. Downy mildew of tobacco. Tobacco blue mold; Tobacco. 72 Connecticut Experiment Station Bulletin 405. FiGUBE 5. The causa] fungus, Peronospora tabacina. A. A single spoorphore showing young summer spores in several stages of development. Most of the spores have already fallen off the tips of the branches. B. Mature summer spores (sporangia or conidia). C. Germination of the summer spores in var- ious stages from one to fom- hours in a drop of water. D. An oospore (winter spore) from the interior of a dead leaf. (Magnified, 400 times natural size.). Please note that these images are extracted

. Diseases of truck crops and their control. Vegetables. Fig. 20. Beet Diseases. a. Crown gall, b. scab, c. downy mildew, d. Conidiophore of Pernnospora schachlii arising from a stomate of an infected beet leaf, e. germinating zoospore of P. schach- lii, f. oospore of P. schachlii, g. Cercospora leaf spot (after Halsted), h. conidiophore and conidia of Cercospora belt cola (after Duggar), i. Phoma leaf spot (after Pool and McKay), k. pycnidium of Phoma beta; (after T. Johnson) (J.-/, after PriUieux).. Please note that these images are extracted from scanned page images that may have been digit Stock Photo

RMRCCKGM–. Diseases of truck crops and their control. Vegetables. Fig. 20. Beet Diseases. a. Crown gall, b. scab, c. downy mildew, d. Conidiophore of Pernnospora schachlii arising from a stomate of an infected beet leaf, e. germinating zoospore of P. schach- lii, f. oospore of P. schachlii, g. Cercospora leaf spot (after Halsted), h. conidiophore and conidia of Cercospora belt cola (after Duggar), i. Phoma leaf spot (after Pool and McKay), k. pycnidium of Phoma beta; (after T. Johnson) (J.-/, after PriUieux).. Please note that these images are extracted from scanned page images that may have been digit

RMRCC31H–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. Fio. 125.âLophodermium nervisequium. Section of a needle of Silver Fir. b, Pycnidium on upper surface shedding conidia. n, AjKJthe- cium on the lower surface. (After R. Hartig.). Fig. 126.âLophodermium neiviiequiuiu on Silver Fir. Portion of a riiH; aiH>the- ciuna. an. Filamentous paraphyses ; rod-like ccIIh (conidia V), *â¢, abjointol from the anex of tllt; Ii:ll*:inli'uÂ«*w * tln^ ii..ci

RMRCD6FD–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. PHYTOPHTHORA. 121. Fig. 3-l.—Phi/to/>hth.nra infeslaas. The Potato disease. A, Potato leaf with brown spots and white patches of fungi on the lower iide. B, Groups of conidio- j.hores emerging from a stoma close beside a hair of the potato leaf. C, Conidio- I'hores and conidia, much enlarged. Z», Leaf of potato much shrivelled up and brown, as in the later stages of the disease, fv. Tubeuf del.). Please note that t

. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES OF SUGAR CANE 321 produced from small stromatic masses on the surface of the spot. The conidia are cylindrical or long elliptical, with very thick walls, olive green to brown in colour, 3-10 septate. Red Leaf-Spot. Red leaf-spot, originally described from Java, is recorded. Fig. 134 Eriosphaeria Sacchari From Wakker & Went Asci AND Spore from the West Indies by Went in Aruba Island and L. H. Gough in Trinidad. It is caused by an ascomycete with round black perithecia and two-celled spores, Eriosphcs Stock Photo

RMRCD8YE–. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES OF SUGAR CANE 321 produced from small stromatic masses on the surface of the spot. The conidia are cylindrical or long elliptical, with very thick walls, olive green to brown in colour, 3-10 septate. Red Leaf-Spot. Red leaf-spot, originally described from Java, is recorded. Fig. 134 Eriosphaeria Sacchari From Wakker & Went Asci AND Spore from the West Indies by Went in Aruba Island and L. H. Gough in Trinidad. It is caused by an ascomycete with round black perithecia and two-celled spores, Eriosphcs

. Diseases of truck crops and their control. Vegetables. ^ ^ ^C .,"• • Fig. 47. Bean Diseases. a. and 6. Rust on leaf and pods. c. section through bean leaf showing bean rust, summer spores, d. section through bean leaf, showing bean rust, wmter spores f. anthracnose, /. section through bean seed, showing relation of anthracnose to the host (f. d. and/, after Whetzel), g. Cercospora leaf spot, h. Isariopsis ^riseola leat spot, i. conidiophores and conidia of Isariopsis.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabil Stock Photo

RMRCCKE1–. Diseases of truck crops and their control. Vegetables. ^ ^ ^C .,"• • Fig. 47. Bean Diseases. a. and 6. Rust on leaf and pods. c. section through bean leaf showing bean rust, summer spores, d. section through bean leaf, showing bean rust, wmter spores f. anthracnose, /. section through bean seed, showing relation of anthracnose to the host (f. d. and/, after Whetzel), g. Cercospora leaf spot, h. Isariopsis ^riseola leat spot, i. conidiophores and conidia of Isariopsis.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabil

. Diseases of truck crops and their control. Vegetables. Fig. 59. Diseases of the Potato. a. Powdery scab, early stage, 6. powdery scab, advanced stage of rotting, c. and d. powdery scab, gall-forming stage on potato roots (c. and d. after Melhus and Rosen- baum), e. single potato cell showing spore balls of the powdery scab fungus (after Melhus), /. black leg, g. common scab, h. to /. drawings of the organism of common scab, showing branching of threads and groups of spores or conidia (after Lutman and Cunningham).. Please note that these images are extracted from scanned page images that may Stock Photo

RMRCCKCN–. Diseases of truck crops and their control. Vegetables. Fig. 59. Diseases of the Potato. a. Powdery scab, early stage, 6. powdery scab, advanced stage of rotting, c. and d. powdery scab, gall-forming stage on potato roots (c. and d. after Melhus and Rosen- baum), e. single potato cell showing spore balls of the powdery scab fungus (after Melhus), /. black leg, g. common scab, h. to /. drawings of the organism of common scab, showing branching of threads and groups of spores or conidia (after Lutman and Cunningham).. Please note that these images are extracted from scanned page images that may

RMRCC3GB–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fig. IdT.— TilUtta liUicc. A, Two spores germinated in moist air; a short promycelium is developed, and bear.s a crown of conidia (sporidia), several of which have fused in pairs. Fushion of conidia, germination, and development of a secondary conidium, C, ;irc rlsn slmwii. B, Two spores germinated in water with ihmijix . i li.i wiiich elongate till the water surf.ace is reached, wlui. tin v t.irm sporidia; the , ,

. Diseases of truck crops and their control. Plants -- Diseases. Fig. 59. Diseases of the Potato. a. Powdery scab, early stage, 6. powdery scab, advanced stage of rotting, c. and d. powdery scab, gall-forming stage on potato roots {c. and d. after Melhus and Rosen- baum), e. single potato cell showing spore balls of the powdery scab fungus (after Melhus),/.black leg, g. common scab, h. to i. drawings of the organism of common scab, showing branching of threads and groups of spores or conidia (after Lutman and Cunningham).. Please note that these images are extracted from scanned page images th Stock Photo

RMRCCKA9–. Diseases of truck crops and their control. Plants -- Diseases. Fig. 59. Diseases of the Potato. a. Powdery scab, early stage, 6. powdery scab, advanced stage of rotting, c. and d. powdery scab, gall-forming stage on potato roots {c. and d. after Melhus and Rosen- baum), e. single potato cell showing spore balls of the powdery scab fungus (after Melhus),/.black leg, g. common scab, h. to i. drawings of the organism of common scab, showing branching of threads and groups of spores or conidia (after Lutman and Cunningham).. Please note that these images are extracted from scanned page images th

$. Diseases of truck crops and their control. Vegetables. , n ^i;" Fig. 54. Onion Diseases. a. Downy mildew, b. mature conidiophore and conidia of Peronospora schleideni, c. fertilization of the female oogonium by the male antheridium, d. oospore (a. to d. after Wh^tzel), e. onion smut, /. spore ball of the smut fungus, g. spore germina- tion, formation of sporidia at x, h. Vermicularia anthracnose, i. section through acervulis of Vermicularia cirdnans. j. setae and spore formation in V. circinans {e. to g., i. and j. after Thaxter), k. pink root of onion, healthy and diseased bulbs, I. pi Stock Photo$

RMRCCKDA–. Diseases of truck crops and their control. Vegetables. , n ^i;" Fig. 54. Onion Diseases. a. Downy mildew, b. mature conidiophore and conidia of Peronospora schleideni, c. fertilization of the female oogonium by the male antheridium, d. oospore (a. to d. after Wh^tzel), e. onion smut, /. spore ball of the smut fungus, g. spore germina- tion, formation of sporidia at x, h. Vermicularia anthracnose, i. section through acervulis of Vermicularia cirdnans. j. setae and spore formation in V. circinans {e. to g., i. and j. after Thaxter), k. pink root of onion, healthy and diseased bulbs, I. pi

RMRCD63N–. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. PASSAL. 21 S).. Fk). ^Vl.— Vtntvria (FimifUutiiuit) tlendriticuui foniiilig brown «ii<it8 on un apple ; those still in the earlier stages have a radiate margin and War conidia. 'I'he cnliirged section shows two rows of large-celled parenchyma of the apple, covered bv a stroma of i)seiidi"parenchyma bearing conidiophores and conidia. (V. TuU-iif del.) F. pirinum (Lib.) (I'.S. America). T

. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 494 DISEASES OF CULTIVATED PLANTS Spore - mass subgelatinous, deep red ; conidia fusiform, curved, 3-5-septate at maturity. Clean seed obtained from a district free from the disease should be sown. There is also a danger of infection from the presence of wild grasses. Yx2iVi,Jahrb. d. Deutsch. Landwirt/i. GeselL, 1892. Matthews,yi'wr/z. Roy. Mor. Soc, 1883, p. 321. Smith, Diseases of Field and Garden Crops, p. 209.. Fig. 149.—Fusarium heterosporum. i, Stock Photo

RMRCDR35–. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 494 DISEASES OF CULTIVATED PLANTS Spore - mass subgelatinous, deep red ; conidia fusiform, curved, 3-5-septate at maturity. Clean seed obtained from a district free from the disease should be sown. There is also a danger of infection from the presence of wild grasses. Yx2iVi,Jahrb. d. Deutsch. Landwirt/i. GeselL, 1892. Matthews,yi'wr/z. Roy. Mor. Soc, 1883, p. 321. Smith, Diseases of Field and Garden Crops, p. 209.. Fig. 149.—Fusarium heterosporum. i,

. Diseases of greenhouse crops and their control. Vegetables; Plant diseases. Fig. 62. Pansy Diseases. a to f. Colletrotrichum violce-tricoloris R. E. Smith, a. affected leaf- let, h. several confluent acervuli with mycelium, setae, and conidia. c, single acervulus, more enlarged, d. basidia and production of conidia, e. conidia, f. affected blossoms, g to i. Fusarium violcc. Wolf, g. forma- tion of microconidia, h. germination of macroconidia, i. macroconidia (o-/ after Smithy R. E.; g to i after Wolf, F. A.).. Please note that these images are extracted from scanned page images that may have Stock Photo

RMRCDK28–. Diseases of greenhouse crops and their control. Vegetables; Plant diseases. Fig. 62. Pansy Diseases. a to f. Colletrotrichum violce-tricoloris R. E. Smith, a. affected leaf- let, h. several confluent acervuli with mycelium, setae, and conidia. c, single acervulus, more enlarged, d. basidia and production of conidia, e. conidia, f. affected blossoms, g to i. Fusarium violcc. Wolf, g. forma- tion of microconidia, h. germination of macroconidia, i. macroconidia (o-/ after Smithy R. E.; g to i after Wolf, F. A.).. Please note that these images are extracted from scanned page images that may have

RMRCC3KA–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. Fig. 125.—Lophoderniimn nervisequium. Section of a needle of Silver Fir. 6, Pyonidium on upper surface shedding conidia. a, Apothc- cium on the lower surface. (After R. Hartig.). Fig. i26.—Lophodermium nervisequium on Silver Fir. Portion of a ripe apothe- ciuin. a a, Filamentous paraphyses ; rod-like cells (conidia?), k, abjointed from the apex of the paraphyses ; the asci contain eight spores about half as long as th

. Diseases of truck crops and their control. Vegetables. Fig. 48. Diseases of Lima Bean. a. h. c. different stages of downy mildew on pods, d. tuft of conidiophores and conidia of Phythophthora phaseoli, e. same as d. but greatly enlarged, /. g. conidia germinating by means of a germ tube, h. i. j. k. germination of conidia by means of zoospores, /. germinating zoospores {d. to /. after Thaxter), m. n. fertilization of the oogonium by the antheridium, o. Phoma blight on foliage, p. Phoma blight on pods (o. and p. after Halsted), r. mature oospores of P. phaseoli {a. to c, m. n. and r. after Cl Stock Photo

RMRCCKE0–. Diseases of truck crops and their control. Vegetables. Fig. 48. Diseases of Lima Bean. a. h. c. different stages of downy mildew on pods, d. tuft of conidiophores and conidia of Phythophthora phaseoli, e. same as d. but greatly enlarged, /. g. conidia germinating by means of a germ tube, h. i. j. k. germination of conidia by means of zoospores, /. germinating zoospores {d. to /. after Thaxter), m. n. fertilization of the oogonium by the antheridium, o. Phoma blight on foliage, p. Phoma blight on pods (o. and p. after Halsted), r. mature oospores of P. phaseoli {a. to c, m. n. and r. after Cl

Conidia Stock Photos and Images

Conidia Stock Photos and Images

Download Confirmation

Password Confirmation

Search Results for Conidia Stock Photos and Images (2,209)

Filter by agency collections

Search builder

Get great features with your free account

Get inspired for your next project!