Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 172 ASCOMYCETES. Sphaerotheca pannosa Wallr. (Britain and America). Tliti liose-niildevv. The mycelium forms a thin white coatiog on the leaves, and is nourished by lobed haustoria inserted into the epidermal cells. Young leaves or buds when attacked become more or less deformed, their function is interfered with, and death may result. In this way great damage is done in rose-gardens. This parasi
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 172 ASCOMYCETES. Sphaerotheca pannosa Wallr. (Britain and America). Tliti liose-niildevv. The mycelium forms a thin white coatiog on the leaves, and is nourished by lobed haustoria inserted into the epidermal cells. Young leaves or buds when attacked become more or less deformed, their function is interfered with, and death may result. In this way great damage is done in rose-gardens. This parasite also attacks young leaves and fruits of peach and apricot. Vui. ijO.~Hiihacrothcca pannosa on Peach. The mycelium aud conidiophoM are shown on tlie epidermis of a leaf. (After Tulasne.) Rose-mildew is propagated during summer by ovoid, uni- cellular conidia abjointed in acropetal series from erect conidio- phores. The perithecia have short simple appendages, and contain elliptical spores. The disease may be combated by ' sulphuring '; according to liitzeina-Bos, spraying with Bordeaux has also shown good results.
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