Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 174 DISEASES OF CULTIVATED PLANTS BOTRYOSPHAERIA (Ces. and De Not.) Stroma innate, subrotund, brownish ; asci clavate, 8-spored; paraphyses present; spores elongated, hyaline, continuous. Briar scab.—This disease, caused by Botryosphaeria dothidea (Ces. and De Not.), now and again appears as an epidemic in a garden, and amongst cultivated roses, it Fin. 44.—Botryosphaeria diplodia. I, fungus on portion of stem of a wild rose, roduccci ; 2, ascus containing 8 s]X)res, highly m
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 174 DISEASES OF CULTIVATED PLANTS BOTRYOSPHAERIA (Ces. and De Not.) Stroma innate, subrotund, brownish ; asci clavate, 8-spored; paraphyses present; spores elongated, hyaline, continuous. Briar scab.—This disease, caused by Botryosphaeria dothidea (Ces. and De Not.), now and again appears as an epidemic in a garden, and amongst cultivated roses, it Fin. 44.—Botryosphaeria diplodia. I, fungus on portion of stem of a wild rose, roduccci ; 2, ascus containing 8 s]X)res, highly mag. appears to exercise much discrimination in the choice of a host. In one garden a bed of ' Soleil D'Or,' and another bed of 'Caroline Testout,'about thirty yards apart, had every plant in each bed badly infected, whereas intervening beds of roses showed no sign of disease. Wild roses throughout the country are frequently met with in a diseased condition. The fungus forms large, slightly raised, black scabs, cracked more or less concentrically, on the bark.
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