. Fungous diseases of plants, with chapters on physiology, culture methods and technique . r is spores measure X A*- (Fig- i74)- Pure cultures ofthis fungus were obtained, but a description of growth characters hasnot yet appeared. Results from most carefully conducted inocula-tion experiments made from pure cultures have clearly demon-strated the parasitic nature of the disease, and the independenceof Coniothyrium in producing it. 1 Clinton thinks (Conn. Agl. Exp. Sta. Rept. (1906): 321-324) that the raspberrycane blight fungus gains entrance through the flowers and
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . r is spores measure X A*- (Fig- i74)- Pure cultures ofthis fungus were obtained, but a description of growth characters hasnot yet appeared. Results from most carefully conducted inocula-tion experiments made from pure cultures have clearly demon-strated the parasitic nature of the disease, and the independenceof Coniothyrium in producing it. 1 Clinton thinks (Conn. Agl. Exp. Sta. Rept. (1906): 321-324) that the raspberrycane blight fungus gains entrance through the flowers and young fruit, the sporesapparently being spread by bees and other insects. In Connecticut the blackcap varieties have been more susceptible, special complaint having been made ofserious injury to the Parmer, Cumberland, and Kansas. It has also, however, in-jured red varieties and occurs on wild black raspberries in the same region. Hepresents no further proof of the connection with Leptosphaeria, but refers thefungus to that genus under the name Leptosphceria Coniothyrium (Fckl.) FUNGI IMPERFECTI 357 Control. It appears that the only practical methods of prevent-ing this disease are to obtain healthy plants at the outset, to avoidplanting where raspberries or other related plants have grown, andto remove and burn old canes as promptly as possible. The resultswith spraying have not thus far been successful. XLVIII. ROSE LEAF BLOTCHAdmonema Rosoi (Lib.) Fr. Cobb, N. A. Black Spot of the Rose. Dept. Agl. N. S. Wales. Miscel. Publ. (2d Ser.) 666 : 2-27. ///. , F. L. Black Spot of Rose Leaves. U. S. Dept. Agl. Rept, (1887): 366-368. ph. 8, g. The rose leaf blotch, or spot, is perhaps the most common andinjurious rose fungus aside from the powdery mildew (p. 224). Thisdisease is characterized by rnoreor less irregular brown spots, fairlywell defined, on the upper sur-faces of the leaves (Fig. 175),varying from a few millimeters indiameter to areas covering moretha
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