西瓜炭疽病,是西瓜的主要病害之一。此病除危害西瓜外,还危害黄瓜、甜瓜。 一、西瓜炭疽病的症状:幼苗发病,先在子叶上生褐色圆形病斑,后蔓延到幼茎,可使幼苗猝倒,叶片上发病,初生水渍状小斑点,扩大后呈圆形黑色病斑,病斑外围有紫黑色晕圈,茎和叶柄上发病,初生水渍状 Watermelon anthracnose, is one of the major diseases of watermelon. In addition to endanger the watermelon disease, but also endanger cucumber, melon. First, the symptoms of watermelon anthracnose: seedling disease, first brown cotyledon round spots on the cotyledons, after the spread to young stems, seedling cataplexy, the incidence of leaves, primary water stains like small spots, enlarged after the round Black spots, spots outside the purple black halo, stem and petiole on the incidence of primary water-like