RF2HA7PHY–Barley powdery mildew or corn mildew caused by the fungus Blumeria graminis is a significant disease affecting cereal crops.
RF2H1M1C1–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RMBDNNTP–Powdery mildew (Oidium euonymi-japonici) infection on a Euonymus fortunei shrub
RMRHTF1T–. Better fruit. Fruit-culture. Page 40. COMPLETE COVERING WITH THE MILDEW Bud that was infected after making a healthy start in the spring few short feeders that draw substance from the plant. The apple powdery mildew is no excep- tion to this general rule. The parasite grows over the surface of the affected portions of the host, and so far as the observations of the writer go it has a very limited internal system. The exter- nal growth of the fungus is, however, very profuse, and affords a very ready means of recognition. This mildew often BETTER FRUIT completely covers the surface of young s
RF2T72AF2–Spraying onions with ammonia from onion flies and pests.
RF2HWYGEW–Apple orchard with grafted trees protected with bordeaux mixture.
RMPG45B8–. Diseases of economic plants . Plant diseases. OBNAMENTAL PLANTS 463 Ascochytose, ray blight (Ascochyta chrysanthemi Stevens). — In this disease, described by Stevens' as doing consider- able damage in North Caro- lina, the ray flowers are blighted, resulting in im- perfect opening of the buds. Thorough spraying with Bordeaux mixture from the beginning of the season un- til blossoming, accompanied by destruction of infected refuse, has proved a satis- factory treatment. Powdery mildew (Oidium chrysanthemi Rbh. of Ery- siphe cichoracearum DC). — This mildew occurs as white, flour-like spots up
RF2HA7PJ0–Barley powdery mildew or corn mildew caused by the fungus Blumeria graminis is a significant disease affecting cereal crops.
RF2H1M1YP–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RMBDNNKK–Powdery mildew (Oidium euonymi-japonici) infection on a Euonymus fortunei shrub
RMRE03PF–. Nature study and agriculture. Nature study; Agriculture. PLANT riREASES 187 fungus that bears the red spores earher in the season. The spores produced late in the season Uve through the winter and start life the next spring by infecting some host plant again. The mildews cover the leaves of plants with a white sub- stance either of a powdery or of a woolly form. The leaves of our lilacs nearly always show mildew except in early summer, and the grape, rose, woodbine, and willow are often affected. Of course, the larger part of the fungus is out of sight within the tissues of its host, and the
RF2RPD17F–Spraying flowers of red roses with a solution of copper sulfate from pests and diseases, close-up.
RM2BFMHCA–young farmer pruning apple tree in spring
RMPG4EDY–. Diseases of economic plants . Plant diseases. CEREALS 375 Anthracnose {Colletotrichum cereale Manns). — This an- thracnose seems to prevail on wheat as extensively as upon rye. Upon wheat the head or parts of it are not destroyed, as in the case of rye, but general weakness of the plant and light shriveled grain follows the attack. Powdery mildew (Erysiphe graminis DC). — The usual characters of the powdery mildews are exhibited: a whitish,. Fig. 160. —Normal wheat kernels and shriveled kernels due to anthracnose. After Manns. flour-like coating in irregular circular spots upon the leaves an
RF2HA7PHM–Barley powdery mildew or corn mildew caused by the fungus Blumeria graminis is a significant disease affecting cereal crops.
RF2H1M23N–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RMPAJYME–Powdery mildew, Podosphaera pannosa, heavy infection around the bases of rose buds 'American Pillar', June
RMRGC38A–. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 712 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Cliief. Washington, D. C. PROFESSIONAL PAPER October 29, 1918 APPLE POWDERY MILDEW AND ITS CONTROL IN THE ARID REGIONS OF THE PACIFIC NORTHWEST.^ By D. F. Fisher, Assistant Pathologist, Fruit-Disease Investigations. CONTENTS. Economic importance of powdery mildew 1 Review of the literature 2 The causal organism 4 Dissemination of the fungus 5 Description of the disease 6 SusceptibUity of varieties 7 Importance of the disease in the Pacific N
RF2T72AM1–Spraying plums from pests and diseases.
RMPG4E78–. Diseases of economic plants . Plant diseases. TBEES AND TIMBER 449 causes a stoppage of the water supply to the more distant portions of the leaf, resulting in dead areas. Dead twigs should be pruned out, and infected material col- lected and burned. Spraying with Bordeaux mixture may be practiced if the expense is warranted. Powdery mildew. See oak. BLACK WALNUT Anthracnose, Gnomoniose {Marsonia juglandis (Lib.) Sacc. of Gnomonia juglandis). — Conspicuous brown spots, 2-4 mm. in diameter, appear upon the leaflets, which soon yellow and fall. Upon the lower sides of the leaf spots are small,
RF2HA77H0–The stem, black, and cereal rusts are caused by the fungus Puccinia graminis and barley powdery mildew or corn mildew caused by Blumeria graminis
RF2H29TKK–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RMPAJYMB–Powdery mildew, Podosphaera pannosa, heavy infection around the bases of rose buds 'American Pillar', June
RMBXGHRA–Powdery mildew (Leveillula taurica) infection on sweet pepper leaf, Portugal
RMAXHTEM–Powdery mildew Leveillula taurica infection on sweet pepper leaf Portugal
RF2TDEKDE–Spraying cherries with boric acid and a solution from parasites.
RMRDD8T7–. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 377 Cedar apples of red cedar (Gymnosporangium macropus Link, and G. glohosiLw, Fart.). See Leaf Rust of Apples. Diseases of Orchards and Vineyards. The powdery mildew of lilac [Microsphcera alni {Walk.) IVint.]. This is the very common blight of lilacs which, in the fall, covers lilac leaves with a conspicuous white mycelial coating. The same blight is apparently found on many other plants, as alder, birches, high bush cranberry and others. Summer spores are produced in the usual manner for powdery mildews and the. Fig. 202
RMPG0G6H–. Diseases of greenhouse crops and their control . Vegetables; Plant diseases; Plant diseases. Fig. 65. Rose Diseases. 0. Pilobolus crystaUinis (i) Group of sporophores, (2) specks on leaf, (3) method in which the spore bearing cap is blown off, (4) spore head magni- fied, (5) young sporophore (after Clinton), b. crown gall, c. Phragmidmm sub- coriicum (after Smith, R. E.), d. powdery mildew.. 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 th
RF2HA77H2–The stem, black, and cereal rusts are caused by the fungus Puccinia graminis and barley powdery mildew or corn mildew caused by Blumeria graminis
RF2H29WCA–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RMTB0J8D–Powdery mildew, Podosphaera pannosa, fungal disease on and around rose thorns, Rosa 'American Pillar'
RF2RD3JRM–Spraying the leaves of zucchini and zucchini from pests. Spraying for the ovary of zucchini flowers.
RMRDE2W1–. Diseases of economic plants . Plant diseases. CEREALS 375 Anthracnose {Colletotrichum cereale Manns). — This an- thracnose seems to prevail on wheat as extensively as upon rye. Upon wheat the head or parts of it are not destroyed, as in the case of rye, but general weakness of the plant and light shriveled grain follows the attack. Powdery mildew (Erysiphe graminis DC). — The usual characters of the powdery mildews are exhibited: a whitish,. Fig. 160. —Normal wheat kernels and shriveled kernels due to anthracnose. After Manns. flour-like coating in irregular circular spots upon the leaves an
RMPG4EK4–. Minnesota plant diseases. Plant diseases. i6o Minnesota Plant Diseases. The fungus can be held in check by a persistent pruning off of the l<nots. Such a pruning prevents the spread of the myce- lium in the tissues of the host. The knots should be immediately. Fig. 192.—Powdery mildew of plums and cherries. 1. Cherry leaf. 2. Spore-sac capsule showing the thread appendages with peculiar forking ends. 3. Spore-sacs, each with eight spores. 4. Very highly magnified spores. 5. A chain of summer spores. 6. Two summer spores germinating. All except 1, highly magnified. After Ellis. burned. Car
RF2HA77J1–The stem, black, and cereal rusts are caused by the fungus Puccinia graminis and barley powdery mildew or corn mildew caused by Blumeria graminis
RF2H29TJP–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RMTB0J6E–Powdery mildew, Podosphaera pannosa, fungal disease on and around rose thorns, Rosa 'American Pillar'
RF2T72AG7–Spraying the tops of potatoes in the country from the Colorado potato beetle and late blight.
RMRG3401–. California plant diseases. Plant diseases. 1114 UNIVERSITY OF CALIFORNIA—EXPERIMENT STATION. Crown Gall. Figure 43. The seedlings of some species frequently develop gall-like swellings on the stem near the surface of the ground. This condition does not seem to be particularly injurious. Cause unknown. Possibly a normal condition. GRApE Mildew (Uncinula spiralis). Figure 44. A white powdery mildew on the leaves and fruit clusters. Dust thoroughly with flowers of sulphur in moist weather before the fungus develops extensively. See Bulletin 186, California Experiment. Fig. 44.—Powdery mildew of
RMPG45E6–. Minnesota plant diseases. Plant diseases. 24 Minnesota Plant Diseases.. Fig. 10.—Various of the most common kinds of fruiting bodies of fungi, 1. Birds-nest fungus. 2. A gill fungus. 3. Caterpillar fungus, one on grub and other on fly. 4. Club fungus. 6. Carrion fungus. 6. Pore fungus. 7. A morel. 8. Puff-ball. 9. Truffle. 10. Cup fungus. 11. Sac-spore-capsulc of powdery mildew (highly magnified). 1-8. After Engler and Prantl; 10, After Rehm; 9 and l"", after Tulasne.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for rea
RF2HA77FC–The stem, black, and cereal rusts are caused by the fungus Puccinia graminis and barley powdery mildew or corn mildew caused by Blumeria graminis
RF2H1M1X7–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RMBG9JWH–Powdery mildew (Erysiphe graminis f.sp. tritici) aborted ear and flagleaf infection on wheat plants
RF2RPD15G–Spraying the tops of potatoes in the country from the Colorado potato beetle and late blight.
RMAXHTJN–Powdery mildew Leveillula taurica infection on sweet pepper leaf Portugal
RMRDE4ED–. Minnesota plant diseases. Plant diseases. 126 Minnesota Plant Diseases. spores. Accessory spores are also found in abundance in these fungi, many being enclosed in special capsules similar in ap- pearance to the sac-capsules. The mycelium is, moreover, often black. Many of these fungi live on leaves but not in a typically parasitic fashion. They thrive well on the excretion of certain insects and since such excretions are found abun-. Fig. 52.—The fruiting body of the powdery mildew of willow, showing the appendages and spore-sacs. The latter have been forced out of splits in the sac-capsule
RF2HA77J7–The stem, black, and cereal rusts are caused by the fungus Puccinia graminis and barley powdery mildew or corn mildew caused by Blumeria graminis
RF2H29W0G–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RM2G5JY88–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RF2RPD14K–Spraying the tops of potatoes in the country from the Colorado potato beetle and late blight.
RMTB0JKJ–Powdery mildew, Podosphaera pannosa, fungal disease on rose leaves, Rosa 'American Pillar', Berkshire, May
RMRDE4F3–. Minnesota plant diseases. Plant diseases. 124 Minnesota Plant Diseases. Pozi'dery mildezt's (Erysiphacecc). The mildews constitute the simplest group of black fungi. The mycelium is usually to be seen on the surface of leaves as a white, moldy covering. The threads send branches into the skin cells of the host and there absorb their food and live parasitically, btit the main my- celium of the fungus never lives inside of the host. In the y f ^ ' .'. ^'y .-^. ''^ â ^i if > â¢V4^ Fig. 50.âa powdery mildew on common plantain leaf. The powdery coat of tlie threads and the small black fruiting
RF2HA77J4–The stem, black, and cereal rusts are caused by the fungus Puccinia graminis and barley powdery mildew or corn mildew caused by Blumeria graminis
RF2H29TFN–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RM2G5JY8D–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RMTB0JPE–Powdery mildew, Podosphaera pannosa, fungal disease on rose leaves, Rosa 'American Pillar', Berkshire, May
RMRDEG8G–. Diseases of economic plants . Plant diseases. TBEES AND TIMBER 449 causes a stoppage of the water supply to the more distant portions of the leaf, resulting in dead areas. Dead twigs should be pruned out, and infected material col- lected and burned. Spraying with Bordeaux mixture may be practiced if the expense is warranted. Powdery mildew. See oak. BLACK WALNUT Anthracnose, Gnomoniose {Marsonia juglandis (Lib.) Sacc. of Gnomonia juglandis). — Conspicuous brown spots, 2-4 mm. in diameter, appear upon the leaflets, which soon yellow and fall. Upon the lower sides of the leaf spots are small,
RF2HJ9GP3–22-spot ladybird, Psyllobora vigintiduopunctata, family Coccinellidae eating powdery mildew on zucchini foliage. Larva on a zucchini leaf.
RF2H1M13P–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RM2G5JY99–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RMTB0JBB–Powdery mildew, Podosphaera pannosa, fungal disease on rose leaves, Rosa 'American Pillar', Berkshire, May
RMRG3424–. California plant diseases. Plant diseases. 1112 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. Root Knot (Nematode). Figure 41. Causes swellings all over the main and smaller roots. Found only in greenhouses. See page 1076. Control as in Stem Rot. Leaf Spot (Altcrnaria hrassicw, var. nigresccns). This fungus has been known to do considerable damage in a few cases, causing large dead spots, later covered with the black fruiting fungus. Not important as yet. Can be controlled with Bordeaux mixture. CURRANT. Mildew (Sphaerothcca mors-uvw). A white, powdery mildew on the leaves and fruit. Dust wit
RF2HKAC0Y–A 22-spot ladybird, Psyllobora vigintiduopunctata, family Coccinellidae eating powdery mildew on zucchini foliage. Larva on a zucchini leaf.
RF2H29W7D–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RM2G5JY7Y–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RMTB0JE0–Powdery mildew, Podosphaera pannosa, fungal disease on rose leaves, Rosa 'American Pillar', Berkshire, May
RMRDBFA9–. Diseases of greenhouse crops and their control . Vegetables; Plant diseases; Plant diseases. Fig. 65. Rose Diseases. 0. Pilobolus crystaUinis (i) Group of sporophores, (2) specks on leaf, (3) method in which the spore bearing cap is blown off, (4) spore head magni- fied, (5) young sporophore (after Clinton), b. crown gall, c. Phragmidmm sub- coriicum (after Smith, R. E.), d. powdery mildew.. 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 th
RF2HJ9GP0–A 22-spot ladybird, Psyllobora vigintiduopunctata, family Coccinellidae eating powdery mildew on zucchini foliage. Adult insect and larva on zucchini
RF2H1M1AX–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RM2G5JY9C–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RMTB0JX4–Powdery mildew, Podosphaera pannosa, fungal disease on rose leaves, Rosa 'American Pillar', Berkshire, May
RMRGBE03–. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE c No. 120 Contribution from the Bureau of Plant Industry, Wm. A. Taylor, Ch September 3, 1914.. APPLE POWDERY MILDEW AND ITS CONTROL IN THE PAJARO VALLEY.1 By W. S. Ballard, Pathologist, Fruit-Disease Investigations, and W. H. Volck, County Horticultural Commissioner of Santa Cruz County, Cat? INTRODUCTION. Apple powdery mildew is a fungous disease which attacks the foliage and young twig growth of the apple. Occasionally it occurs on pears, more particularly on nursery stock in damp or foggy locali- ti
RF2HJ9GP7–22-spot ladybird, Psyllobora vigintiduopunctata, family Coccinellidae eating powdery mildew on zucchini foliage. Adult insect on a zucchini leaf.
RF2H29TTP–affected by diseases and pests of plant leaves and fruits of cucumber White rot sclerotinosis diseases of cucumbers is white rot white mold. Downy mildew peresporosis, White rot sclerotinosis.
RM2G5JY84–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RMTB0JG1–Powdery mildew, Podosphaera pannosa, fungal disease on rose leaves, Rosa 'American Pillar', Berkshire, May
RMRG3323–. California plant diseases. Plant diseases. 1150 UNIVERSITY OF CALIFORNIA—EXPERIMENT STATION. growth or fruiting wood. During the spring rains a jelly-like gum exudes in large quantities from these dead spots. Spray with Bordeaux mixture during November and again with the same material or lime-sulphur just before the buds open. A combined spraying may be made for blight, curl leaf and peach worm by using Bordeaux in the fall and lime-sulphur in the spring. See Bulletin 191, California Experiment Station. Mildew (Podosphaera oxyacanthce). A white powdery mildew appearing on the leaves during t
RF2JPAGJW–White round spots on the leaves of cucumber in the garden, a fungal disease.
RF2H6D5B0–A very dangerous grape disease that affects the aerial parts of the plant, covering the upper side of the leaves with a white coating. Dark spots appear on diseased leaves. Spots appear turn brown
RM2G5JY8C–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RMTB0JYK–Powdery mildew, Podosphaera pannosa, fungal disease on rose leaves, Rosa 'American Pillar', Berkshire, May
RMRDE343–. Minnesota plant diseases. Plant diseases. i6o Minnesota Plant Diseases. The fungus can be held in check by a persistent pruning off of the l<nots. Such a pruning prevents the spread of the myce- lium in the tissues of the host. The knots should be immediately. Fig. 192.—Powdery mildew of plums and cherries. 1. Cherry leaf. 2. Spore-sac capsule showing the thread appendages with peculiar forking ends. 3. Spore-sacs, each with eight spores. 4. Very highly magnified spores. 5. A chain of summer spores. 6. Two summer spores germinating. All except 1, highly magnified. After Ellis. burned. Car
RF2JPAGKA–White round spots on the leaves of cucumber in the garden, a fungal disease.
RF2H554BH–A very dangerous grape disease that affects the aerial parts of the plant, covering the upper side of the leaves with a white coating. Dark spots appear on diseased leaves. Spots appear turn brown
RM2G5JY8G–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RMCBNWD7–Powdery mildew (Erysiphe graminis f.sp. tritici)) infection on a wheat crop in ear
RMRFYHE1–. California plant diseases. Plant diseases. "Bulletin 218] CALIFORNIA PLANT DISEASES. 1111 Rust (Puccinia sorghi). A powdery, red rust on the leaves. Not serious. Mold (Diplodia zcw). The corn becomes moldy and covered with fungus growth in the ear. <Quite common in this State on moist land. Affected ears should be destroyed. COTTON. Boll Rot. The seed and a part of the lint are affected with a soft decay while the bolls are still green. Cause unknown. Possibly bacterial. Noticed for the first time in Imperial Valley in 1910.. Fig. 41.—Nematode galls on cucumber root. CUCUMBER. Mildew
RF2HW6GAW–Mass of Botrytis cinerea spores on an infected snap bean pod. Fungal disease - Grey mould.
RF2H4G2T0–A very dangerous grape disease that affects the aerial parts of the plant, covering the upper side of the leaves with a white coating. Dark spots appear on diseased leaves. Spots appear turn brown
RM2G5JY83–Rhododendron yakushimanum Kokhiro Wada flowers in close-up, natural plant portrait
RMBJR3AJ–Powdery mildew (Leveillula taurica) infected tomato crop in polytunnel, Portugal
RMRDE4R4–. Minnesota plant diseases. Plant diseases. 24 Minnesota Plant Diseases.. Fig. 10.—Various of the most common kinds of fruiting bodies of fungi, 1. Birds-nest fungus. 2. A gill fungus. 3. Caterpillar fungus, one on grub and other on fly. 4. Club fungus. 6. Carrion fungus. 6. Pore fungus. 7. A morel. 8. Puff-ball. 9. Truffle. 10. Cup fungus. 11. Sac-spore-capsulc of powdery mildew (highly magnified). 1-8. After Engler and Prantl; 10, After Rehm; 9 and l"", after Tulasne.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for rea
RF2HW6GAG–Mass of Botrytis cinerea spores on an infected snap bean pod. Fungal disease - Grey mould.
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