In order to investigate the effects of biopesticide against powdery mildew in Osmnda japonica ,four biopesticides of sujing ,brevibac-terium ,osthole and tuichoderma harzianum were used during the periods of leaf expending ,rapid growing and stop growing .The results demon-strated that all of the four biopesticides showed variously inhibitory effects on powdery mildew of Osmnda japonica .Among them ,the lowest inci-dence was observed with tuichoderma harzianum treatment;the lowest infection index was examined by sujing treatment .Under the treatment of the four biopesticides ,old plants showed the lower infection rates ,but higher infection indexes than that of young palnts .%采用速净、枯草芽孢杆菌、蛇床子素、哈赤木霉等4种生物农药，分别于展叶期、生长盛期和停止生长期3次给药，对薇菜白粉病进行防治试验。结果表明，4种生物农药对薇菜白粉病均有不同程度的抑制作用，其中，哈赤木霉处理发病率最低，速净处理感病指数最低。经4种药剂处理后，从发病率来看，新蔸的发病率均低于老蔸；从感病指数来看，蛇床子素与枯草芽孢杆菌对新蔸防治效果好，速净与哈赤木霉对老蔸防治效果好。
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