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棉花轮纹叶斑病（AlternariamacrosporaZimm．）又称棉花黑斑病，可造成棉花叶片焦枯脱落，严重影响棉花产量。棉花轮纹叶斑病过去在馆陶发生很轻，２００１年突然严重发生。据调查，该病为害棉花叶片，发病初期在中、下部叶片上出现红褐色小圆斑，后扩展成不规则形或近圆形褐?
Alternaria macrospora Zimm. Also known as cotton black spot disease, can cause the cotton leaves scorch off, seriously affecting the cotton yield. Cotton leaf spot leaf spot in the past occurred in the Museum of pottery very light, suddenly serious in 2001. According to the survey, the disease damaging cotton leaves, early onset in the middle and lower leaves appear reddish brown small circular spot, after the expansion into an irregular or nearly circular brown?