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棉铃虫是北方特早熟棉区主要害虫之一，其发生频率高，用药次数多，使其对杀虫剂易产生抗性，致使防治困难，对棉花生产构成威胁。为摸清棉铃虫的抗性发展规律，我们于１９９７～２０００年选择主产棉区朝阳作为抗性监测点，监测棉铃虫对拟除虫菊酯类氯氰菊酯、有机磷类久效磷
Cotton bollworm is one of the major pests in especially precocious cotton area in North China. Its occurrence frequency and medication frequency make it easy to produce insecticide, which makes it difficult to control and threaten the cotton production. In order to find out the rule of development of resistance to H. armigera, we selected the sunrise of main cotton producing area as the monitoring point of resistance from 1997 to 2000, and monitored the effects of H. armigera on the growth of pyrethrin cypermethrin,