5个中华按蚊种群对溴氰菊酯的抗性及抗性选择反应

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 and Selection Response in Anopheles Sinensis to Deltamethrin.

Resista nce lev els to deltam ethrin in fiv e na tural po pulations of Anopheles sinensis Wiedema nnw ere m easured. The m edial lethal concentra tions ( L C50 s ) of delta m ethrin in th ese popula tio ns w erehigh er than their susceptible str ains, especia lly in Wenzhou po pulatio n tha t had a resistance ratio( R R50 ) o f 11 r ela tiv e to its susceptible st rain. Resistant str ains w e re selec ted w ith deltam ethrin fo r 12g ener atio ns. Resista nce lev els in resistant st rains w ere 130～ 190 fo lds as their susceptible strains, and10～ 40 fo lds as their natura l po pulatio ns. Response o f selection( R) in th e resista nt strain fr om W en-zho u popula tion w as less tha n 0. 1, and tho se in resistant strain fr om o th er na tural po pula tio ns w erem o re than 0. 1. It indica tes that a resistant strain fo rm a natur al po pulation w ith high r esistance has low -er incr ease ratio of r esista nce than a resistant strain fr om a na tural po pulatio n w ith low resistance underidentical insecticide selectio n. These results a re discussed in relatio n w ith m osquito co nt ro l str ategies.