一、发病病状幼苗受害,在近地表的茎基部变为黑褐色,病斑缢缩,瓜苗折倒(非猝倒病)。成株期受害,不同瓜类稍有差异。叶片病斑近圆形,黄瓜红褐色、冬瓜黄褐色、西瓜黑褐色,后期病斑上产生小黑粒点,潮湿时其上有粉红色粘质物,干燥时干枯或穿孔。蔓或叶柄上的病斑长圆形,水渍状稍凹 First, the pathogenesis of seedling damage, the base of the surface near the surface into a dark brown, lesion shrinkage, melon seedlings collapse (non-damping-off disease). Adult damage, different melons slightly different. Leaf lesions nearly round, cucumber reddish brown, melon brown, watermelon dark brown, late black spot on the lesion, moist when it has pink sticky substance, dry or perforated when dry. Phalaenopsis or petiole lesions oblong, water-like slightly concave