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一、发病症状该病主要危害叶片 ,也侵染嫩枝、叶柄、花梗和花。感病初期叶面出现黑褐色、圆形或近圆形病斑 ,直径3～ 1 3毫米 ,边缘呈紫褐色或黑褐色 ,并有放射状。后期病斑上生许多黑色疱状小点。有时病斑周围大面积叶组织变黄 ,病叶极易脱落 ,严重落叶时 ,仅剩光秃的枝条 ,有
First, the symptoms of the disease The main hazards of the leaves, but also infected with twigs, petioles, pedicel and flowers. Early onset of foliar dark brown, round or nearly circular lesions, diameter 3 ~ 13 mm, the edge was purple brown or dark brown, and radial. Post-lesion many black blister-like dots. Sometimes a large area around the lesion leaf tissue yellow, diseased leaves easily fall off, severe deciduous leaves, bare branches, there