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从田间采集棉铃虫３龄幼虫，用点滴法连续测定３对６种杀虫剂的抗药性。结果表明：萧县棉铃虫对溴氰菊酯、氰戊菊酯、来福灵的抗性发展速度在加快，目前抗性指数平均每年以５．７、４．８、５．２倍的速度递增，至１９９４年抗性指数分别为３１．５、１５．６、１７．７倍，均达中抗水平；对久效磷、灭多威抗药性的发展速度较慢，抗性指数平均每年以０．５和０．７倍的速度递增，至１９９４年发展至２．７和３．２倍，仍处敏感阶段；棉铃虫对氧化乐果的抗药性亦在发展之中。
The 3rd instar larvae of cotton bollworm were collected from the field and the resistance of 3 pairs of 6 insecticides was measured continuously by the drip method. The results showed that the development of resistance to deltamethrin, fenvalerate and leflunomide in Xiaoxian cotton bollwash accelerated, and the current resistance index averaged at 5.7, 4.8 and 5.2 times per year Increasing to 1994, the resistance index was 31.5, 15.6, 17.7 times, respectively, reached the level of resistance; the monocrotophos, methomyl resistant to drug development is slow, the average annual resistance index With 0.5 and 0.7 times the rate of increase to 1994 and 2.7 and 3.2 times, is still sensitive stage; cotton bollworm resistance to omethoate is also under development.