浙江省淡色库蚊和白纹伊蚊对常用化学杀虫剂的抗性调查

目的了解浙江省淡色库蚊和白纹伊蚊不同地理株对敌敌畏等8种常用杀虫剂的抗性动态,为指导灭蚊工作的深入开展提供科学依据。方法采用浸渍法,测定4龄期幼虫的半数致死浓度(LC50)。结果金华市淡色库蚊对氯菊酯的抗性处于中抗水平,抗性倍数为11.5倍;绍兴市淡色库蚊对高效氯氰菊酯的抗性处于中抗水平,抗性倍数为11.2倍;各调查点淡色库蚊对其他一些化学杀虫剂均处于低抗水平;金华市白纹伊蚊对敌敌畏已产生高度抗性,抗性倍数为22.8倍,对氯菊酯和胺菊酯的抗性处于中抗水平,抗性倍数分别为13.4和11.4倍;宁波市白纹伊蚊对溴氰菊酯、高效氯氰菊酯的抗性处于中抗水平,抗性倍数分别为17.2和11.8倍;义乌市白纹伊蚊对高效氯氰菊酯已产生高度抗性,抗性倍数为28.8倍,对溴氰菊酯和氯菊酯的抗性处于中抗水平,抗性倍数分别为19.7和18.4倍;各调查点白纹伊蚊对其他一些化学杀虫剂均处于低抗水平。结论淡色库蚊和白纹伊蚊各地理株对8种常用杀虫剂均产生了不同程度的抗性,以菊酯类最高,应加强对菊酯类杀虫剂的抗性监测及科学合理使用。

Resistance investigation of Culex pipiens pallens and Aedes albopictus to eight pesticides and resistance control strategy in Zhejiang province

Objective To investigate the resistances of Culex pipiens pallens and Aedes albopictus to eight insecticides for making the dynamic mosquitoe control strategy in Zhejiang.Methods Immersion method of pesticide was used to assay the medium lethal concentration(LC 50) for the fourth instar larvae of mosquitoes.Results The resistances of Cx.pipiens pallens in Jinhua city to permethrin was at medium level,the RR 11.5.The resistances of Cx.pipiens pallens in Shaoxing city to beta-cypermethrin was at medium level,the RR 11.2.The Cx.pipiens pallens showed low resistance to other types of insecticides in all cities.In Jinhua city,the resistances of Ae.albopictus to dichlorvos was at high level,the RR 22.8.The resistances of Ae.albopictus to permethrin and tetramethrin were at medium level,the RR 13.4 and 11.4,respectively.In Ningbo city,the resistances of Ae.albopictus to deltamethrin and β-cypermethrin were at medium level,the RR 17.2 and 11.8,respectively.In Yiwu city,the resistances of Ae.albopictus to betacypermethrin was at high level,the RR 28.8.The resistances of Ae.albopictus to deltamethrin and permethrin were at medium level,the RR 19.7 and 18.4,respectively.The Ae.albopictus showed the lower resistance in other area.Conclusion The Cx.pipiens pallens and Ae.albopictus demonstrated varied resistance to the pesticides,and were mostly resistant to pyrethroid pesticide.The monitoring of their insecticide resistance should be strengthened in conjunction with scientific and proper application of insecticides.