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黑斑病黑斑病由真菌引起,主要危害叶片、嫩枝和花梗等部位。8、9月份发病较重,叶片感病初期,仅为紫褐色或褐色小点,日渐扩大成为圆形,直径在3至10毫米左右,病斑周边呈明显的放射状。后期病斑叶片周围变黄,病斑上有小黑点,即
Black spot black spot disease is caused by fungi, the main damage to leaves, shoots and pedicel and other parts. In August and September, the incidence was heavier, and the early stage of leaf sensitization was only a purple-brown or brown dot, gradually expanding into a round shape with a diameter of about 3 to 10 millimeters. The periphery of the lesion was obviously radial. Late yellow leaves around the lesion spot on a small black spots, that is