小菜蛾对苦皮藤素抗性选育及交互抗性测定

敏感小菜蛾Plutella xylostella (L.)经苦皮藤素20代的抗性选育，其抗性增长21.57倍。选育的小菜蛾抗性品系对杀虫双、杀螟丹和叶蝉散分别有4.63、4.11和3.71倍的交互抗性；对溴氰菊酯、氯菊酯、氯氰菊酯分别有0.22、0.01和0.26倍的负交互抗性。高抗杀螟丹、杀虫双小菜蛾品系对苦皮藤素无明显交互抗性，而高抗溴氰菊酯小菜蛾品系对苦皮藤素有3.61倍的交互抗性。

Selection for celangulin resistance and cross-resistance in the diamondback moth,Plutella xylostella (L.)

After artificial selection for resistance to 0 .2% celangulin EC for 20 generations, resistance of the diamond back moth, Plutella xylostella (L.) fourth instar larvae to this pesticide increased 21 .6-fold. The development of resistance was slow initially, faster in the mid stage, and stable in the later stage. The celangulin resistant strain had positive cross resistance to dimehypo, cartap and isoprocarb (R/S was 4 .63, 4 .11 and 3 .71 respectively), and negative cross resistance to deltamethrin, cypermethrin and permecthrin (R/S was 0 .22, 0 .26 and 0 .01 respectively). The cartap-, dimehypo- and deltamethrin-resistant strains had 1 .06-, 1 .76- and 3 .61-fold resistance to 0 .2% celangulin EC, respectively.