印楝素和蜡蚧轮枝菌对胡瓜钝绥螨的毒力测定

Toxicity tests of Azadirachtin and Verticillium lecanii to Amblyseius cucumeris Oudemans

分别测定定了0.3%印楝素乳油、蜡蚧轮枝菌对天敌胡瓜钝绥螨的毒性．施药后10d 的观察结果，0.3%印楝素乳油直接喷于胡瓜钝绥螨虫体时毒性很小，药后10d的 LC_(50)为5.01mg·L^(-1)，回归线性方程 y=1.2294x+0.5260；胡瓜钝绥螨取食用0.3%印楝素乳油处理过的柑桔全爪螨则无中毒表现，即无毒性；蜡蚧轮枝菌对胡瓜钝绥螨寄生率为0，基本无毒性，故释放胡瓜钝绥螨生防园可采用0.3%印楝素乳油和蜡蚧轮枝菌防治茶小绿叶蝉、柑桔害螨、柑桔粉虱、蚧壳虫、蚜虫等害虫，既能有很好的防效又能保护天敌胡瓜钝绥螨。

The toxicity of 0.3% Azadirachtin emulsion comentration and Verticillium lecanii to Amblyseiuscucumeris Oudemans were tested.The results showed that 0.3% Azadirachtin emulsion comentration had sometoxicity to Amblsyseius cucumeris Oudemans.The LC_(50) to Amblyseius cucumeris Oudemans was 5.01 mg·L^(-1)regression linear equation was y=1.2294x+0.526.But it showed no toxicity to Amblyseius cucumeris Oudemansafter Amblyseius cucumeris Oudemans eat the citrus spider mite that were treated by 0.3% Azadiraehtin.AndVerticillium lecanii also had no toxicity to Amblyseius cucumeris Oudemans.So adopting 0.3% Azadirachtin andVerticillium lecanii to control green leaf hopper,citrus pest mite,citrus white fly.citrus scale,aphid and otherpests.not only acquirc better control effects but also protect the natural enemies—Amblyseius cucmerisOudemans.