一、危害病状打瓜从幼苗到成熟炭疽病在叶、蔓、果实上均可发生,生长中后期发生较严重。幼苗发病时,近地面茎蔓变成黑褐色,缢缩猝倒;叶片受害时,初为小的黄色水渍状圆斑,后扩大为褐色,病斑周围有黑色圈,其上生长小黑点,病斑逐渐扩大,相互连接成片,使叶片枯死;叶柄上和茎蔓上会呈现狭长褐色凹陷病痕,病痕扩展,茎蔓逐渐死亡;果柄染病,幼果颜色深 First, the harm of the disease Fight melon seedling to mature anthracnose in the leaves, vine, fruit can occur, the more serious growth in the late. Seedling incidence, near surface stems turned into a dark brown, shrinking down; leaf damage, the beginning of a small yellow water stains, and then expanded to brown, spots around the black circle, the growth of black Spots, lesion gradually expanded, connected to each other into pieces, so that the leaves withered; Petiole and stalk will appear narrow brown dehiscent lesions, scars extended, stalks gradually died; fruit stalk disease, young fruit color depth