夏季降雨可为西瓜田多种病菌的侵染和传播提供机会,特别是连阴雨过后出现雾天或雷雨天,可加重发病程度。其主要症状及防治方法是:一、枯萎病地上瓜秧萎蔫、死亡,剖开茎蔓基部可见维管束变褐色。防治方法(一)用10%西瓜枯霸800倍液灌根;(二)用绿亨一号3000倍液灌根;(三)用枯萎克 Summer rains can provide opportunities for the infection and spread of various germs in watermelon fields, especially when there is foggy or thunderstorm days after the overdeath, which can aggravate the incidence. Its main symptoms and methods of prevention and treatment are: First, the wilt disease melon seedlings on the ground, death, dissection stalk base visible vascular bundle brown. Prevention and treatment methods (a) with 10% watermelon khaki 800 times irrigated roots; (b) with a green lothen root 3000 times irrigated root; (three) with wither grams