【摘要】 研究棉铃虫Ｈｅｌｉｃｏｖｅｒｐａａｒｍｉｇｅｒａ（Ｈｕｂｎｅｒ）对三种拟除虫菊酯（氰戊菊酯、溴氰菊酯、功夫菊酯）的抗性稳定性及敏感性恢复表明，即使棉铃虫对氰戊菊酯的抗性达到３１６６．３倍以上，抗性仍不稳定，经１４代室内饲养后抗性下降为６１．４倍；对一系列田间抗性种群的抗性稳定性研究后发现，棉铃虫对这三种拟除虫菊酯的抗性不稳定，在没有杀虫剂选择的情况下，开始几代抗性下降较快，当下降到一定水平（２～９倍）后，抗性比较稳定，很难完全恢复对拟除虫菊酯的敏感性。更多还原

【Abstract】 Regression of pyrethroids resistance in Helicoverpa armigera (Hubner)following several generations of insecticide-free laboratory rearing was evaluated.Although laboratory selected Fen-R strain had extremely high level resistance to fenvalerate (3 166.3 fold), the resistance was unstable and decreased to 61.4 fold after 14 generations when selection was suspended. Studies on several field-collected cotton bollworms resistant to pyrethroids (fenvalerate, deltamethrin & cyhalothrin) showed that their resistance was also unstable; it declined rapidly without contact with the pyretroids at first and then stablized at a 2￣9 fold level. It seemed very difficult to recover susceptibility completely to the three pyrethroids.更多还原