. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 266 MYCOLOGY C. glmosporioides, clovers and alfalfa by C. trifolii and the snapdragon by C. antirrhini. Usually the diseases on these plants induced by species of Colletotrichum are known as anthracnose (Fig. 107). Coryneum Bei- jerinckii is a destructive fungus causing the peach blight. Pestalozzia Guepini var. vaccinii is a fungus often found upon the cranberry leaves and fruits. The conidiospores are three-celled, the terminal cells with filiform appendages. The shot-hole disease of


. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 266 MYCOLOGY C. glmosporioides, clovers and alfalfa by C. trifolii and the snapdragon by C. antirrhini. Usually the diseases on these plants induced by species of Colletotrichum are known as anthracnose (Fig. 107). Coryneum Bei- jerinckii is a destructive fungus causing the peach blight. Pestalozzia Guepini var. vaccinii is a fungus often found upon the cranberry leaves and fruits. The conidiospores are three-celled, the terminal cells with filiform appendages. The shot-hole disease of plum and cherry is due to Cylindrosporium padi. The formation of the acervuli is followed by the falling out of the disease areas of the leaf resulting in the formation of the characteristic shot-hole. The fruit spot of apples is caused by C. pomii. III. HYPHOMYCETALES. —The hyphse are septate, branched in or on the substra- tum. They are dark, or hyaline, separate, or bound into coremia, or layer-like cushions. The con- idiospores may exist as oidio- spores through the separation of the hypha;. The conidiophores are simple, or branched. The conidiospores of different shapes and colors are borne in a variety of ways on the conidiophores or their branches. The genera rriay be arranged in three series. A. Mycelium and spores hght- colored: Oospore, Monilia, Oidium, Sporotrichum, Botrytis, Cephalothecium, Ramularia, Cercos- porella, Piricularia. B. Mycelium dark-colored at least with age; spores generally dark: Fusicladium, Polythrincium, Scoletotrichum, Clado- sporium, Helminlhosporium, Macrosporium, Alternaria, Cercospora, C. Conidiophores in the form of a tuberculate mass, or sporodochium: Volutella, Fusarium. As examples of common disease producing forms of the above genera without enumerating all of the more important species may be mentioned the potato scab fungus, Actinomyces chro- mogenes, the early blight of potato fungus, Macrosporiums olani; the. Fig., 108.—Sweet-po


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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917