7种杀虫剂对江西地区草地贪夜蛾室内毒力测定

Laboratory Toxicity of Seven Insecticides Against Spodoptera frugiperda Larva in Jiangxi Province

【目的】草地贪夜蛾Spodoptera frugiperda(J.E.Smith)是危害巨大的杂食性害虫,化学农药是其防治的最后一道防线,明确不同杀虫剂对草地贪夜蛾的毒力对该害虫防治具有重要意义。【方法】通过室内毒力测定探究7种化学杀虫剂对江西南昌地区草地贪夜蛾种群的毒力。【结果】7种杀虫剂毒力由强到弱依次为甲氨基阿维菌素苯甲酸盐、虫螨腈、氯虫苯甲酰胺、虱螨脲、辛硫磷、茚虫威、高效氟氯氰菊酯,其LC50分别为0.0231,1.1642,2.0315,2.0355,2.3593,15.9575,25.6886 mg/L。【结论】推荐甲氨基阿维菌素苯甲酸盐、虫螨腈、氯虫苯甲酰胺作为江西地区草地贪夜蛾应急化学防控药剂,为江西地区草地贪夜蛾化学防治与抗药性区域治理提供了理论依据。

[Objective] Spodoptera frugiperda(J.E.Smith) is a highly damaging omnivorous pest for which chemical pesticides are the last line of integrated pest management.It is important to identify the toxicity of different insecticides against S.frugiperda for the control of this pest.[Method] In this study,the toxicity of seven chemical insecticides against S.frugiperda populations in Nanchang,Jiangxi was investigated by laboratory toxicity measurements.[Result] The toxicity was from strongest to weakest in the following order:emamectin benzoate > chlorfenapyr > chlorantraniliprole > lufenuron > phoxim > indoxacarb > lambda-cyhalothrin,and their values of lethal concentration of 50% were 0.023 1,1.164 2,2.031 5,2.035 5,2.359 3,15.957 5 and 25.688 6 mg/L,respectively.[Conclusion]Therefore,emamectin benzoate,chlorfenapyr and chlorantraniliprole are recommended as chemicals for emergent prevention and control of S.frugiperda in Jiangxi.This study also provides a theoretical basis for chemical control and regional management of insecticide-resistance in Jiangxi.