西瓜常见的病害有:枯萎病、炭疽病、蔓枯病、病毒病,严重影响西瓜产量和品质,现将其发生危害与防治方法介绍如下: 枯萎病 1 为害症状 幼苗受害,不能出土而腐烂,或出土后受害子叶萎蔫,真叶黄化,茎部收缩变褐而猝倒。成株发病,生长缓慢,下部叶片发黄逐渐向上发展,新发病时,在中午气温升高从下部叶片开始似失水状萎蔫,傍晚逐渐恢复,次日中午又表现萎 Watermelon common diseases are: blight, anthracnose, gummy blight, virus disease, seriously affect the yield and quality of watermelon, now the occurrence of the hazards and prevention methods are described below: Wilt 1 damage symptoms Seedlings can not be unearthed and decay, Or unearthed damaged cotyledons, true leaves yellow, stem shrinkage and brown cataplexy. Adult disease, slow growth, the lower part of the yellow leaves gradually upward development, the new onset, at noon temperature began to appear from the lower leaves of the watery wilting, gradually restored in the evening, the next day and showed wilt