. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ,color, septation, etc., of sporesand conidiophores, or in themacroscopic appearances ofspots, are generally employedin distinguishing many other species the following upon important hostsmay be mentioned. Cercospora Viticola Sacc. This fungus produces a spot knownas grape leaf blight. It has not been productive of serious damiageexcept during unusually moist seasons. Thespots are first evident on the lower surface ofthe leaf, and it is also upon this surface thatthe conidiophores are devel
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ,color, septation, etc., of sporesand conidiophores, or in themacroscopic appearances ofspots, are generally employedin distinguishing many other species the following upon important hostsmay be mentioned. Cercospora Viticola Sacc. This fungus produces a spot knownas grape leaf blight. It has not been productive of serious damiageexcept during unusually moist seasons. Thespots are first evident on the lower surface ofthe leaf, and it is also upon this surface thatthe conidiophores are developed. Upon Am-pelopsis qidnqiiefolia a Cercospora is morecommonly found, but apparently no com-parative study of these different forms hasbeen made. Cercospora circumscissa Sacc. is one of theshot-hole-producing leaf fungi of the genusPrunus. It occurs on some of the nativeAmerican as well as cultivated species ofplums and cherries (Fig. 147) and on the nec-tarine and peach. It is, however, not so important from a patho-logical point of view upon most of these hosts as Cylindrosporiiim. Fig. 147. Cercosporacircumscissa: Spots onAlmond. (After Pierce) FUNGI IMPERFECTI 315 Padi, but it is important as an almond tree disease^ in Californiaand elsewhere. Cercospora Nicotianae E. & E. The more commonly observedleaf spot or frog eye of the tobacco has been reported from manytobacco-growing regions, but does not appear to be a disease of
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