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葡萄褐斑病的发生规律与防治葡萄褐斑病近几年在昌黎发生为害严重，叶片受害率３０％～４０％，给葡萄生产带来了严重的经济损失。１症状病斑圆形或不规则椭圆形，直径约１．５～３．０ｍｍ，严重时融合成不规则大型病斑。病斑中心呈黄褐色，有时有轮纹，外缘有一圈狭窄的...
Occurrence of grape brown spot disease and prevention and treatment of grape leaf spot in recent years, the occurrence of serious damage in Changli, leaf damage rate of 30% to 40%, to grape production has brought serious economic losses. 1 Symptoms of disease spot circular or irregular oval, diameter of about 1.5 ~ 3.0mm, severe integration into irregular large lesions. Lesions were yellowish brown center, and sometimes round pattern, the outer edge of a circle of narrow ...