杀虫剂对斜纹夜蛾和家蚕的毒力选择性研究

为寻找对斜纹夜蛾Spodoptera litura高效且对家蚕Bombyx mori相对安全的杀虫剂品种,以此指导桑园科学合理用药。采用浸叶法测定了14种常用杀虫剂对斜纹夜蛾和家蚕的毒力,比较了药剂在两者之间的毒力选择性。结果表明,供试杀虫剂对斜纹夜蛾的毒力顺序依次为茚虫威〉甲氨基阿维菌素苯甲酸盐〉溴虫腈〉甲氧虫酰肼〉多杀菌素〉溴氰菊酯〉高效氯氟氰菊酯〉氟虫腈〉毒死蜱〉虫酰肼〉阿维菌素〉丙溴磷〉高效氯氰菊酯〉灭多威;对家蚕的毒性顺序依次为甲氨基阿维菌素苯甲酸盐=阿维菌素〉溴氰菊酯〉多杀菌素〉高效氯氰菊酯〉茚虫威〉高效氯氟氰菊酯〉毒死蜱〉虫酰肼〉灭多威〉氟虫腈〉丙溴磷〉甲氧虫酰肼〉溴虫腈。供试杀虫剂中以溴虫腈对斜纹夜蛾和家蚕的毒力选择性最高,其毒力选择性比值（家蚕LC50/斜纹夜蛾LC50）为36.26;其次为茚虫威,毒力选择性比值为5.56;阿维菌素的毒力选择性比值最低。由此认为,溴虫腈是适合防治桑园斜纹夜蛾且对家蚕安全的杀虫剂品种。

Selective toxicity of insecticides between Spodoptera litura and Bombyx mori

To screen insecticides with high effect against Spodoptera litura and safe to Bombyx mori and guide scientific and rational application of pesticides in mulberry field, the seletctive toxicity of 14 insecticides between S. litura and B. mor/was investigated by leaf dipping method in the laboratory. The results showed that the toxicity order of 14 insecticides to S. litura was arranged as follows： Indoxacarb 〉 emamectin benzoate 〉chlorfenapyr 〉 methoxyfenozide 〉 spinosad 〉 dehamethrin 〉 lambda-cyhalothrin 〉 fipronil 〉 chlorpyrifos 〉 tebufenozide 〉 abamectin 〉 profenofos 〉 beta-eypermethrin 〉 methomyl. The toxicity order to B. mor/was arranged as follows： emameetin benzoate = abameetin 〉 deltamethrin 〉 spinosad 〉 beta-eypermethrin 〉indoxacarb 〉 lambda-cyhalothrin 〉 chlorpyrifos 〉 tebufenozide 〉 methomyl 〉 fipronil 〉 profenofos 〉 methoxyfenozide 〉 chlorfenapyr. The seletctive toxicity of chlorfenapyr was the highest among 14 insecticides tested, and its seletctive toxicity ratio（STR, B. mori LC50/S. litura LCs0）reached 36.26. Indoxacarb showed rather high seletctive toxicity, and STR was 5.56. The seletctive toxicity of abamectin was the lowest. The results suggest that chlorfenapyr is an insecticide suitable to control S. litura in mulberry field and safe to B. mori.