【摘要】 对棉铃虫（HelicoverpaarmigeraHubner）9个地理种群的抗寒能力进行了研究。棉铃虫非滞育蛹和滞育蛹的过冷却点分别分布于-19．13℃至-18．16和-19．53℃至-19．03℃范围内，随纬度升高，地理种群的过冷却点是降低趋势。非滞育蛹在低温下的生存能力显著低于滞育蛹。采自北部特早熟棉区的辽宁省辽阳市种群，其抗寒性和华北种群无明显区别，但长江流域棉区的湖北省武穴种群显著低于华北种群。武穴种群、新乡种群、高密种群、定兴种群和北京种群1995年在北京西郊的越冬率依次为0％、0％、4．43％、16．67％和25％。依据上述研究结果，作者认为我国棉铃虫的越冬北界应在1月份平均最低温度-15℃等温线左右，长江流域棉铃虫在华北地区难以越冬，北部特早熟棉区棉铃虫由华北地区迁入。更多还原

【Abstract】 Cold hardiness of cotton bollworm from nine geographic regions in China was inves-tigated in the laboratory and field. The supercooling points (SCP) of non-diapausing and dia-pausing pupae of different populations ranged from - 19. 13℃ to - 18. 16℃ and - 19. 53 ℃ to- 19.03℃, respectively, generally, SCPs of geographic populations increased with the de-creased latitude. The differences of 50% lethal times (LT50s) indicated that survival of dia-pausing pupae was significantly higher than that of non-diapausing pupae. Under the same lowtemperature conditions, no difference in mortality of pupae was found between northeastChina, higher latitude, and north China, lower latitude populations, suggested that the for-mer population immigrate from the latter region ; but the pupae mortalities of the two regionswere significantly higher than that of Wuxue population from Changjiang Cotton Area. Theoverwintering rates for the populations from Wuxue, Xinxiang, Gaomi, ixngxing and Beijingwere 0%, 0%, 4. 34%, 16.67%, and 25%, respectively, tested in Beijing field in 1995.Based on the above results, overwintering boundary as the - 15℃ mean lowest temperature inJanuary for cotton bollworm was defined. It was also suggested that the population fromChangjiang Cotton Area was impossible to overwinter in north China.更多还原