甘孜州丹巴县致倦库蚊幼虫对3种杀虫剂抗性研究

Resistance of culex quinquefasciatus larvae to three insecticides in Danba County of Ganzi Prefecture

目的 调查甘孜州丹巴县致倦库蚊幼虫对3种杀虫剂抗性情况,为合理的使用杀虫剂提供参考。方法 采用国家标准推荐的浸渍法,测定甘孜州丹巴县有代表性的4个乡镇的致倦库蚊幼虫对敌敌畏、残杀威、溴氰菊酯的抗性水平,获得致倦库蚊幼虫对3种杀虫剂的LC50值及其95%CI值,比较其抗药性程度。结果 甘孜州丹巴县致倦库蚊幼虫对敌敌畏、残杀威、溴氰菊酯的LC50(95%CI)值分别为0.406 2(0.332 5~0.508 4)mg/L、0.173 7(0.114 3~0.265 9)mg/L、0.003 1(0.0010~0.020 6)mg/L。对敌敌畏、残杀威均未产生抗性(RR分别为0.85、1.34);对溴氰菊酯产生低抗性(RR为3.65)。结论 甘孜州丹巴县致倦库蚊幼虫对溴氰菊酯产生了低抗性。应减少使用拟除虫菊酯类杀虫剂,轮换使用较为敏感的杀虫剂,以控制蚊虫抗性的发展。

Objective To investigate the resistance of culex quinquefasciatus to three commonly used insecticides of Danba County in Ganzi Prefecture,to provide a guide for the rational insecticides application.Methods The resistance of culex quinquefasciatus to dichlorvos,propoxur,deltamethrin from four representative townships of Danba County was measured by larval immersion,as recommended by the national standard.The LC50 values and 95%CI of culex quinquefasciatus larvae against three insecticides were obtained,and the degree of resistance was compared.Results The LC50 and the corresponding 95%CI of dichlorvos,propoxur,deltamethrin for culex quinquefasciatus larvae were 0.4062(0.3325-0.5084)mg/L,0.1737(0.1143-0.2659)mg/L,0.0031(0.0010-0.0206)mg/L,respectively.The culex quinquefasciatus in Danba County of Ganzi Prefecture were sensitive to dichlorvos(RR:1.34)and propoxur(RR:0.85),and low resistant to deltamethrin(RR:3.65).Conclusions The culex quinquefasciatus in Danba County of Ganzi Prefecture has developed some resistance to deltamethrin.Pyrethroid insecticides should be reduced in mosquito control,alternated by sensitive insecticides,to control the development of resistance.