. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PODOSPHAERA. 175 This mildew has inflicted great Dusting the threatened P. myrtillina Schub. on leaves of Vaccinium MyrtUlus (bil- berry), V. uliginosum, and JSmpetntm nigmm (crowberry), ( America). Erysiphe. The perithecia contain several asci, each with two to eight oval hyaline spores. The appendages are like these of Sphae- rotheca, simple and thread-like. Erysiphe graminis D. C. Mould or mildew of grass and
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PODOSPHAERA. 175 This mildew has inflicted great Dusting the threatened P. myrtillina Schub. on leaves of Vaccinium MyrtUlus (bil- berry), V. uliginosum, and JSmpetntm nigmm (crowberry), ( America). Erysiphe. The perithecia contain several asci, each with two to eight oval hyaline spores. The appendages are like these of Sphae- rotheca, simple and thread-like. Erysiphe graminis D. C. Mould or mildew of grass and wheat. Grass and cereals, especially wheat, often suffer serious damage from this parasite. The mycelium appears on the leaves as white or brownish spots, generally on the upper surface. Colourless conidia (Oidium. vionilioides, Lk.) are produced acro- petally in chains. The somewhat rare perithecia have brown appendages, and contain eight to sixteen asci, with four to eight spores each; the spores mature in spring as the dead leaves lie on the ground. loss both in Europe and America, crop with " flowers of sulphur" will probably check the first stages of an attack, but care in destroying infected crops is by far the most effective preventive. Erysiphe martii Lev. This fre- quents various Leguminosae (clover, beans, vetches, peas, lupines, etc.), Cruciferae, and other plants (Britain and America). Er. umbelliferarum De Bary. Occurs on various Umbelliferae (Britain). Er. communis Wallr. on tobacco, also on various Eanun- culaceae, Papilionaceae, etc. (Britain and America). Er. tortilis Wallr. on Gornus sanguinea (Britain and America). Er. galeopsidis D. C. on Labiatae (Britain and America). Er. cichoriacearum D. 0. on Compositae, Boragineae, and also causing considerable damage to cucumbers (Britain and America).. Fig. 72.—Erynphe umbeUiferarum. Germination of a conidium (sp) on Antki-iscus sylvestris. An attach- ment-disc has been formed, a
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