【摘要】 试验表明，福州地区田间小菜蛾已对有机磷、氨基甲酸酯及拟除虫菊酯产 生高抗性。脱离选择压力3代后，小菜蛾的抗性水平迅速下降。Bt预处理可提高抗性和敏感小菜蛾幼虫 对有机磷的敏感性，尤其对抗性小菜蛾增效极显著，对敏感小菜蛾AChE的 K i值则影响不 大。据此提出在抗性治理中，应轮用或换用不同毒理机制的杀虫剂，且其间隔至少为2～3代 。更多还原

【Abstract】 High resistances to organophosphates(OPs), carbamates and pyrethroids were found in the field strain of diamondback moth(DBM), P. xylostella (L.),in Fuzhou,Fu jian Province. The resistance quickly decreased after DBM were released from selection pressure for only 3 generations，and significant synergism to OPs i n R strain was found after 24 h pretreatment with Bt. The activities of AchE wer e strongly depressed by Bt pretreatment in R Strain. The higher values of K i were detected in R Strain with Bt pretreatment, but no significant changes in S strain. The results showed that the resistance management of insecticides with different toxicity mechanism, in volving alternating and mixing insecticide , should be adopted in IPM strategies.更多还原