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对中国科学院昆明植物园引种栽培的 2 40种 (品种 )秋海棠进行两年调查观察 ,发现有 35种 (品种 )不同程度地感染白粉病 ,部分种类受害严重 ,野生种类较栽培品种更易感病。用 75 %百菌清和 5 %粉锈宁可湿性粉剂稀释 5 0 0倍液 ,每隔 5d轮换或混合喷施一次 ,连续施药 5～ 6次 ,可起到很好的防治效果
Two hundred and forty species (varieties) of Begonia introduced and cultivated in Kunming Botanical Garden, Chinese Academy of Sciences, were investigated for two years and 35 species (varieties) were found to be susceptible to powdery mildew to varying degrees. Some species were seriously affected and wild species were more susceptible than cultivars. 75% chlorothalonil and 5% triadimefon WP diluted 500 times, every 5d rotation or mixed spray once, continuous application of 5 to 6 times, can play a very good control effect