棉铃虫对拟除虫菊酯杀虫剂敏感性的修复及其乙酰胆碱酯酶的变化

利用生物测定和生物化学方法研究了抗药性棉铃虫Helicoverpa armigera(Hubner)对拟除虫菊酯敏感性修复及其体内乙酰胆碱酯酶的变化，结果表明：当去除药剂选择压后，棉铃虫对拟除虫菊酯的抗性为不稳定。随着停止用药的时间加长，敏感性增加。从田间收集的棉铃虫在室内饲养后第1代对拟除虫菊酯的抗性下降速度较迅速。特异性酶抑制剂对敏感和抗性棉铃虫种群的乙酰胆碱酯酶亲和力试验结果证实，乙酰胆碱酯酶在抗性棉铃虫对杀虫剂反应发生变化的过程中发生改变，这种酶的改变可能对棉铃虫抗药性的不稳定性有重要影响。

REHABILITATION OF SENSITIVITY TO PYRETHROIDS AND VARIATION OF ACETYLCHOLINESTERASE IN HELICOVERPA ARMIGERA (HUBNER) (LEPIDOPTERA: NOCTUIDAE)

The resistance and rehabilitation of sensitivity to pyrethroids and the variation of acetylcholinesterase in cotton bollworm Helicoverpa armigera were studied by bioassay and biochemistry method. The results showed that the resistance of cottonbollworm to pyrethroids was unstable and the sensitivity to the insectcides increased with the time after withdrawal of stress. The rehabilitation of sensitivity in the first generation of cotton bollworm fed at the insectary was more rapid. The results of affinity tests between special inhibitors and acetylcholinesterase of the cotton bollworm confirmed that variation of acetylcholinesterase was taken place during the decrease of resistance to pyrethroids in cotton bollworm, and it might have a significant impact on the stability of this resistance.