7种杀虫剂对不同地区草地贪夜蛾田间种群的毒力测定

Toxicity of 7 Insecticides Against the Different Geographical Field Populations of Spodoptera frugiperda

草地贪夜蛾作为入侵我国的重大迁飞性害虫,对我国的农业生产造成了重要的影响,化学防治是目前防控草地贪夜蛾的主要措施。本研究通过采集云南嵩明县和开远市、安徽泾县和江苏涟水县4个地区的草地贪夜蛾田间种群,采用浸叶法于室内测定7种杀虫剂对4个田间种群的毒力。结果表明,双酰胺类杀虫剂对4个种群草地贪夜蛾的致死中浓度(LC_(50))为9.64~41.14 mg/L;甲氨基阿维菌素苯甲酸盐对4个田间种群的毒力较好,其LC_(50)值均小于0.01 mg/L;茚虫威对4个种群草地贪夜蛾的LC_(50)值为8.22~14.65 mg/L;虫螨腈对4个田间种群的LC_(50)值在0.55~3.27 mg/L;乙基多杀菌素对4个田间种群的LC_(50)值为0.13~0.44 mg/L。该研究结果可为草地贪夜蛾的化学防控提供科学用药指导。

As a major migratory pest,Spodoptera frugiperda has a significantly neyative impact on our country's agricultural production.Currently,chemical control is still the main measure to control S.frugiperda.In this study,4 field populations of S.frugiperda were collected in Songming and Kaiyuan of Yunnan province,Jingxian of Anhui province and Lianshui of Jiangsu province.The toxicity of 7 insecticides against 4 field populations were detected by leaf immersion method.The results showed that the LC_(50) value of diamide insecticides to 4 geographical populations against S.frugiperda were 9.64-41.14 mg/L.The LC_(50) of emamectin benzoate which showed good insecticidal activity against the 4 field populations were less than 0.01 mg/L.The LC_(50) values of indoxacarb were 8.22-14.65 mg/L.The LC_(50) value of chlorfenapyr and spinetoram against 4 field populations were 0.55-3.27 and 0.13-0.44 mg/L,respectively.The results of this study could provide scientific guidance for the chemical control of S.frugiperda.