环渤海湾地区棉铃虫的抗药性水平及成因分析

１９９４～１９９７年测定了环渤海湾地区１６个点２６个棉铃虫种群对三氟氯氰菊酯、辛硫磷和硫丹的抗性水平。对三氟氯氰菊酯的抗性为６５．４３～４４２倍，对辛硫磷的抗性为１０．２８～９０．９３倍，对硫丹的抗性为６．３４～２９．１７倍，地区之间年度内总体上差异不大。对采自辽宁省辽阳市种群的抗性稳定性研究表明，解除农药选择压后棉铃虫的抗药性下降较快，１７代后对三氟氯氰菊酯、辛硫磷和硫丹的抗生水平由２１３．７１

THE COORDINATED DEVELOPMENT AND ANALYSIS OF CONTRIBUTING FACTORS OF COTTON BOLLWORM RESISTANCE TO INSECTICIDES IN ROUND-BOHAI BAY-REGION

The cyhalothrin, phoxim and endosulfan resistance levels of cotton bollworm, Helicover-pa armigera (Hubner) , collected from 16 locations in Round-Bohai Bai-Region from 1994 to 1997, were determined as 65.43 - 442, 10.28 - 90.93 and 6.34-29.17-fold, respectively in comparison with a susceptible cotton bollworm population, and no significant differences were detected in the same year among the populations from the southern, middle and northern areas where the spraying frequency of insecticides in crop fields were different. After rearing in the laboratory for 17 generations without insecticide treatment, the resistance of the Liaoyang strain to cyhalothrin, phoxim and endosulfan decreased from 213.71, 34.53 and 8.5-folds to 3, 3.54 and 1.96-folds, respectively . Based on the mentioned results above, it is suggested that the populations of cotton bollworm in middle and northern parts around the Bohai sea immigrate from the south.