炭疽病是瓜类作物的主要病害之一,分布广,危害严重。西瓜叶片受害后,初期表现近圆形的水渍状黄褐色病斑,以后很快变为紫黑色或黑色;瓜蔓上病斑最初为水渍状黄褐色,后变为长圆形深紫色或紫褐色;幼果感病时,往往整果变黑,收缩腐败;未成熟的果实发病,常畸形,且易早期脱落;成熟果实上病斑圆形,水渍状,凹陷,淡绿色,后变黑褐色或紫褐 Anthracnose is one of the main diseases of melon crops, widely distributed and endangered. Watermelon leaves victims, the initial performance of nearly circular water-like brown spots, later quickly become purple black or black; melon on the lesion was originally water-like brown, then into oblong dark purple Or purple brown; young fruit susceptible, tend to darken the whole fruit, shrinkage corruption; immature fruit disease, often deformity, and easy to fall off early; ripe fruit on the disease spots round, water-like, depression, light green, After dark brown or purple brown