家蝇对氯氰菊酯抗性的研究

用氯氰菊酯对对采自赤峰市区的自然种群的家蝇进行抗性品系和衰减品系的选育。抗性品系的筛选在12代期间9代的选盲,获得抗性品系（cyp—R）,抗性倍数达2001倍,筛选后后代2D50值（3.36±24μg/（?））比筛选前F1代LD50值（0.138μg/（?））提高了 25.51倍。对自然种群的家蝇进行室内正常饲养为衰减品系（cyp—R）,经6代饲养;抗性倍数为28.92,筛选后F6代LD50值（0.04864μg/（?））比筛选前F1代下降了2.7倍。家蝇对氯氰菊酯的抗性上升较快,而下降较慢,有效地控制家蝇对氯氰菊酯的抗性的发生发展,具有重要意义。

Laboratory Selection For Cypermethrin Reasistant and Reasistant Down Strains in House Fly

A cypermethrin resistant strain (cyp - R) of house fly, was obtained by laboratory selection of a strain collected from Chifeng City in 2000 after nice selection withcypermethrin during twelve generations, and exhibited about 2001-flod resistant to this insecticide as Compared with a susptible strain from laborating, The LD50 valve (3. 3624/μg/(?)) in F12 generation after selction increased to 25. 51-fold as compare with the LD50 valve (0. 138μg/(?)) of F1, A cypermethrin resistant down strain (cyp-D) was developed by laboratory selection of a strain colected from Chifeng city in 2000 after six generations, and exhibited about 28. 92-fold risistance to this insectide as compared with a susoeptible strain from laboratory. The LD50 Valve (0. 0486/μg/(?)) in F6 generation after selection downed to 2. 7-fold as compare with the LD50 valve (0. 1318μg/(?)) of F1.