蔬菜苗期会患猝倒病、立枯病、黑根病、沤根等，如管理不善，容易引起烂种或幼苗大量死亡。一、主要病害的症状粹倒病：幼苗茎基部呈水渍状病斑，以后病都变黄褐色，缢缩成线状，在子叶凋萎之前，幼苗便猝倒。高温多湿时，病部长出白色绵毛状霉层。立枯病：茎基部长出椭圆形暗 Vegetable seedlings will suffer from damping-off, blight, black root disease, scab root, etc., such as poor management, easily lead to a large number of dead or seedling deaths. First, the symptoms of the main disease Purely pour disease: seedling stem base was water stain-like lesions, after the disease has become brown, shrinking into linear, cotyledons before seedling cataplexy. When the hot and humid, the disease Minister white moldy mold layer. Blight: stem base grow oval dark