三种淡色库蚊抗菊酯品系的生存力比较

目的 在实验条件下通过对3种拟除虫菊酯抗性品系的蚊虫选育,了解抗性发生、发展规律,为蚊、蝇的防制提供理论依据。方法 采用浸液法,分别用三氟氯氰菊酯、溴氰菊酯、胺菊酯对淡色库蚊进行抗性品系的选育,了解抗性发生、发展规律;分析抗性品系的种群生存力等主要生物学特征,比较3个品系的相对适合度。结果 胺菊酯不易产生抗性,在连续选育8代后抗性仅达4．66倍;三氟氯氰菊酯、溴氰菊酯易产生抗性。对三氟氮氰菊酯抗性经6代的选育后达到41．8倍,对溴氰菊酯抗性经5代的选育后达到50．68倍。结论 抗性品系存在相对适合度缺陷。三氟氮氰菊酪、溴氰菊酯、胺菊酯抗性品系相对适合度分别为0．41、0．47和0．29。

Comparative Study on Living Capacity of Pyrethroid-resistant Strains of Culex pipiens pallens

Objective To study the living capacity of pyrethroid-resistant strains of Culex pipiens pallens for the scientific basis about chemical control of mosquitoes.Methods Culex pipiens pallens was selected successively with lambda-cyhalothrin?deltamethrin?tetramethrin in laboratory.Some biological parameters were compared between sensitive strain and resistant strain.Results It was found that the rates of bloodfeeding and surviving in larvae and pupae of resistant strain declined.Relative fitness of lambda-cyhalothrin-resistant by net reproductive rates (R 0) was 0.41.Relative fitness of deltamethrin-resistant by net reproductive rates (R 0) was 0.47.Relative fitness of tetramethrin-resistant by net reproductive rates (R 0) was 0.29.Conclusion There existed low relative fitness among resistant strains of Culex pipiens pallens.