5个中华按蚊种群对溴氰菊酯的抗性及抗性选择反应

Resistance and Selection Response in Anopheles Sinensis to Deltamethrin.

经浙江省５个中华按蚊自然种群和敏感品系对溴氰菊酯抗性测定，发现其致死中浓度（ＬＣ５０）都比各自的敏感品系高，特别是来自温州的中华按蚊，其抗性比率（ＲＲ５０）达１１倍之多．将各自然种群的蚊虫进行抗性筛选１２代，发现其抗性水平与敏感品系相比，高达１３０～１９０倍；与其自然种群相比达１０～４０倍．来自温州种群的抗性品系的选择性反应（Ｒ值）小于０．１，而其它抗性品系大于０．１，这表明从抗性概率较高的自然种群中筛选的抗性品系，其抗性增加速率低于那些从抗性概率较低的自然种群中所筛选的抗性品系，即５个自然种群的抗性潜能应该是相似的．最后对相应的蚊虫防治策略进行了讨论．

Resistance levels to deltamethrin in five natural populations of Anopheles sinensis Wiedemann were measured. The medial lethal concentrations (LC 50 s) of deltamethrin in these populations were higher than their susceptible strains, especially in Wenzhou population that had a resistance ratio(RR 50 ) of 11 relative to its susceptible strain. Resistant strains were selected with deltamethrin for 12 generations. Resistance levels in resistant strains were 130～190 folds as their susceptible strains, and 10～40 folds as their natural populations. Response of selection(R) in the resistant strain from Wenzhou population was less than 0.1, and those in resistant strain from other natural populations were more than 0.1.It indicates that a resistant strain form a natural population with high resistance has lower increase ratio of resistance than a resistant strain from a natural population with low resistance under identical insecticide selection. These results are discussed in relation with mosquito control strategies.