The bollworm larvae from Kashi,Aksu,Shanshan,Turpan,Hami,Changji,Bole,Ili of Xinjiang were collected and 8 bollworm geographical populations were developed after artificial feeding.It was deter-mined that the supecooling point,low temperture living capacity (LT50 ),hemolymoph sugar content in dif-ferent geographical diapause pupae of bollworm were compared with the cold resistance of different geo-graphical populations bollworm measured by Logger-220 supercooling instrument showed that the differ-ences of supercooling point between bollworms with different geographical populations in Xinjiang were not significant (P >0.05).Under room conditions of -15 ℃ and -20 ℃,time of 50% lethal individuals required 13 days,0.4 day respectively.The differences between the populations were not significant (P >0.05).The result of sugar content measured by diapause pupae of hemolymph of bollworm of different geo-graphical populations showed that the differences between different populations were not significant (P >0.05).The hemolymph sugar content in diapause pupae of male bollworm from Kashi,Aksu,Shanshan, Turpan,Harmi,Changji,Bole,Ili populations,Xinjiang were 2.72-3.10 mg/100mg,that of female boll-worm were 2.65-3.02 mg/100mg.There were no differences in cold resistance of different geographical populations bollworm in Xinjiang.%采集新疆喀什、阿克苏、鄯善、吐鲁番、哈密、昌吉、博乐、伊犁的棉铃虫幼虫,人工饲养建立8个棉铃虫地理种群,通过测定棉铃虫不同地理种群滞育蛹的过冷却点、低温生存能力(LT50)及血淋巴中糖含量来比较不同地理种群棉铃虫的耐寒性。利用 Logger-220过冷却仪对棉铃虫过冷却点的测定结果表明,新疆不同地理种群棉铃虫之间过冷却点差异不显著(P >0.05)。新疆不同地理种群棉铃虫的滞育蛹在-15℃和-20℃的室内条件下,50%个体致死所需的时间(LT50)分别为13.0 d和0.4 d,种群间差异不显著(P >0.05)。新疆不同地理种群棉铃虫滞育蛹血淋巴中的含糖量测定结果表明,不同种群间差异不显著(P >0.05)。新疆棉铃虫喀什、阿克苏、鄯善、吐鲁番、哈密、昌吉、博乐、伊犁种群雌虫滞育蛹血淋巴含糖量为2.72~3.10 mg/100mg,雄虫为2.65~3.02 mg/100mg。新疆不同地理种群棉铃虫的耐寒性不存在差别。
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