在排除迁移的条件下，研究了对氰戊菊酯抗性水平不同的棉铃虫越冬蛹的死亡率，并用点滴法测定了越冬前后群体的抗药性。结果表明：对氰戊菊酯抗性较高的东台品系，越冬死亡率也高，越冬后抗性水平有所下降；而抗性较低的南京品系，越冬死亡率低，越冬后抗性水平下降不明显。说明越冬期间对氰戊菊酯抗性较高的棉铃虫蛹具有一定的适合度劣势。 Under the condition of removing migration, the mortality of overwintering pupae of bollworm with different levels of fenvalerate resistance was studied, and the resistance of the population before and after overwintering was measured by using the drip method. The results showed that the Dongtai strains with higher resistance to fenvalerate also had higher overwintering mortality and lower resistance after overwintering. However, the Nanjing lines with lower resistance had lower overwintering mortality and post-winter resistance The decline is not obvious. This indicates that the pupae of Helicoverpa armigera, which had higher resistance to fenvalerate during winter, had some disadvantages of fitness.