南阳市淡色库蚊对4种杀虫剂的抗药性测定

Resistance of Culex pipiens pallens to four insecticides in Nanyang city

目的了解南阳市淡色库蚊对双硫磷、仲丁威、溴氰菊酯及高效氯氰菊酯4种杀虫剂的抗药性现状,为制定防治对策提供科学依据。方法浸渍法,测定淡色库蚊4龄期幼虫的半数致死浓度(LC50)。结果淡色库蚊对双硫磷、仲丁威抗性指数分别为1.65、1.33,处于敏感水平;对溴氰菊酯和高效氯氰菊酯抗性指数分别为25.79和10.00,抗性水平分别为高抗和中抗。结论南阳市淡色库蚊对溴氰菊酯和高效氯氰菊酯抗性较高,在今后的蚊虫防治工作中应注意科学合理使用杀虫剂。

Objective To investigate the resistance of Culex pipiens pallens to four insecticides in Nanyang and provide scientific evidence for its control.Methods The dipping method recommended by WHO was used to assay the media lethal concentration（LC50） of the forth-instar larvae.Results The resistance rates of Culex pipiens pallens to temephos,fenobucard were 1.65,1.33 respectively.The resistance rate to deltamethrin was 25.79 reaching the high level.The resiatance rate to beta-cypermethrin was in medium level of 10.00.Conclusion The result shows that the resistance level of Culex pipiens pallens to deltamethrin and beta-cypermethrin is higher and these insecticides should be used scientifically.