Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 114 Diseases of Economic Plants is the first symptom of disease. The entire bush may suc- cumb, but not usually during the first season. Upon splitting the stems a discoloration of the bark and wood near the base is noticed. No effective treatment is known. Mycosphaerella leaf-spot ' (Mycosphcerella grossularice (Fr.) Lind., Septoria). — The spots on the leaf are small (3 mm.), circular, brown-bordered, with blanched centers Fig, 56. — Currant leaf-spot. After Stewart and Eustace. which bear
Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 114 Diseases of Economic Plants is the first symptom of disease. The entire bush may suc- cumb, but not usually during the first season. Upon splitting the stems a discoloration of the bark and wood near the base is noticed. No effective treatment is known. Mycosphaerella leaf-spot ' (Mycosphcerella grossularice (Fr.) Lind., Septoria). — The spots on the leaf are small (3 mm.), circular, brown-bordered, with blanched centers Fig, 56. — Currant leaf-spot. After Stewart and Eustace. which bear numerous, minute, black pycnidia. Heavy infection causes defoliation. Both currants and gooseberries are affected. Treatment is as for the following disease. Angular leaf-spot {Cercospora angulata Wint.).—This term is applied to a peculiar spotting of the leaves of both currants and gooseberries. It is likely to occur wherever these plants are grown. The spot is of rather characteristic appearance, irregular or angular in outline, generally about 3 mm. in diameter. In the center of the brown or gray, dis-
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