. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PERONOSPORA. 133 oospore-coat (oospores of P. viciae have a coat with a regular net- work). It occurs on stems, leaves, and petioles of clovers, lucerne and other Papilionaceae, often with disastrous effect. P. sparsa, Berk. (Britain and U.S. America). This parasite on the rose was first observed in England. It injures indoor roses, causing a fall of the leaf, preceded by the appearance of lilac-coloured spots which
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. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PERONOSPORA. 133 oospore-coat (oospores of P. viciae have a coat with a regular net- work). It occurs on stems, leaves, and petioles of clovers, lucerne and other Papilionaceae, often with disastrous effect. P. sparsa, Berk. (Britain and U.S. America). This parasite on the rose was first observed in England. It injures indoor roses, causing a fall of the leaf, preceded by the appearance of lilac-coloured spots which, on the underside of the leaf, are closely beset with a white coating of conidiophores.^. Fig. 43.—Peronos2)ora viciae. Conidiophores and conidia. (v. Tubeuf del.) P. arborescens (Berk.). On leaves and shoots of wild and cultivated poppies; especially injurious to seedlings of garden species. P. parasitica (Pers.) (Britain and U.S. America). This pro- duces greater or less deformation of attacked stems of many wild and cultivated Cruciferae. Amongst cultivated plants the most liable to injury are the varieties of turnips and cabbage, radish, rape, cress, wallflower, also the mignonette. It is generally found along with Cystopus candidus on shepherd's purse (Capsella). P. cytisi, Eostr., 2 attacks seedlings of laburnum in Denmark, causing death in a few days. The leaves become brown spotted, ^ Zeitschrift f. P.-hranh., II., p. 386, (description of attack in Silesia.) ^ Eostrup, Zeitschrift f. PflanzenJcranlcheiten, ] 892. Magnus, Uedxuigia, 1892.. 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.. Tubeuf, Karl, freiherr von, 1862-1941; Smith, William G. London ; New York [etc. ] : Longmans, Green & co.