炭疽病是西瓜的主要病害,从西瓜的幼苗期至瓜果的成熟期都会发生。幼苗期受害,茎基部变为黑褐色,瓜苗折倒。藤蔓期发病,蔓、叶受害处呈现黑色或紫黑色的病斑。瓜果期发病,瓜果上呈现水渍状绿色病斑,幼果早脱落,成果病斑扩大变为深褐色或紫色,直至龟裂、腐烂。 Anthracnose is the main disease of watermelon, which occurs from the seedling stage of watermelon to the fruit ripening stage. Seedling damage, stem base into dark brown, melon seedlings fall down. The incidence of vines, vine, leaf damage at the black or purple black lesions appear. The incidence of fruits, fruits appear on the water-like green spots, young fruit early off, the results of lesions expanded to dark brown or purple, until the crack, decay.