南昌市不同生境致倦库蚊的抗药性研究

Current insecticide resistance of Culex pipiens quinquefasciatus in different habitats in Nanchang,China

目的了解不同生境致倦库蚊对敌敌畏等6种杀虫剂的抗药性状况,为防制对策的制定提供理论依据。方法分别采自南昌市不同方位(东、南、西、北、中)、不同生境致倦库蚊幼虫、卵或成虫,在实验室饲养繁殖1～2代后,采用浸渍法进行测定。结果 5个不同生境种群致倦库蚊对残杀威、双硫磷和敌敌畏的抗性倍数分别为1.19～2.05、0.57～1.80、0.57～1.73倍,表现为较敏感,对菊酯类杀虫剂氯菊酯和氯氰菊酯的抗性倍数分别是5.33～56.83和10.39～42.17倍,表现出不同程度的抗药性。结论南昌市不同生境致倦库蚊对残杀威、双硫磷和敌敌畏无明显抗药性,对氯菊酯和氯氰菊酯为中、高抗性,应加强对菊酯类杀虫剂的抗药性监测工作及其科学合理使用。

Objective To determine the resistance of Culex pipiens quinquefasciatus in different habitats in Nanchang to 6 kinds of insecticide such as dichlorvos,providing the basis for development of control measures.Methods The larvae,eggs and adults of Cx.pipiens quinquefasciatus were collected from different habitats in the east,south,west,north and central part of Nanchang city.After 1 to 2 generations of laboratory breeding,the insecticide resistance of the subjects was measured by the impregnation method.Results The resistance coefficients of the mosquitoes from 5 different habitats were 1.19-2.05,0.57-1.80 and 0.57-1.73 times to propoxur,temephos and dichlorvos,suggesting that the mosquitoes were sensitive to these insecticides.Their resistance coefficients to pyrethroids such as permethrin and cypermethrin were 5.33-56.83 and 10.39-42.17 times,indicating different degrees of resistance.Conclusion There were no insecticide resistance of Cx.pipiens quinquefasciatus against propoxur,temephos and dichlorvos in different habitats in Nanchang,China.On the contrary,there were midium and high resistance against permethrin and cypermethrin.The monitoring of its inseticide resistance should be strengthened in conjunction with proper application of insecticides in order to delay resistance evolution.