红棕象甲Rhynchophorus ferrugineus(Olivier)是我国危害棕榈科植物的重要入侵害虫,为探明其越冬抗寒性,利用过冷却点测定仪测定了红棕象甲上海种群不同虫态的过冷却点,在低温箱内测定了该虫不同虫态的耐寒性,然后结合田间越冬模拟试验、气象资料和寄主分布情况,初步确定了红棕象甲在我国的越冬北界。结果表明:红棕象甲过冷却点随虫态的发育程度的升高而下降,卵、1龄幼虫、5龄幼虫、9龄幼虫和成虫的平均过冷却点分别为-5.92,-6.42,-7.19,-7.43和-11.84℃,过冷却点由高到低的顺序依次为:卵>幼虫>成虫。在6,24,48和72h4个时间处理下,各虫态在低温与存活率之间呈显著或极显著的logistic回归,半致死温度(Ltemp50)均随处理时间的延长而上升,不同虫态在处理72h后,卵、1龄幼虫、5龄幼虫、9龄幼虫和成虫之间的Ltemp50分别为1.61,-1.67,-2.39,-2.40和-0.40℃,各虫态耐寒性由弱到强的顺序依次为:卵<成虫<幼虫。红棕象甲不同发育阶段的过冷却点与其耐寒性并不完全相关,幼虫和成虫均可能是该虫的越冬虫态。连续两年的田间模拟越冬试验表明,在上海地区,红棕象甲的幼虫和成虫的越冬存活率均在60%以上,说明红棕象甲在上海地区是可以越冬的。根据这些结果,结合寄主分布情况,初步将红棕象甲在我国的越冬北界定于北纬35°附近,即1月份0℃等温线左右。 Rhynchophorus ferrugineus (Olivier) is an important pest infesting palms in our country. In order to prove its overwintering cold resistance, the supercooling point The cold resistance of the insect in different insect states was measured in a low temperature oven. Based on the overwintering simulation experiment, meteorological data and host distribution in the field, the red palm weevil was initially identified as the overwintering northern boundary in China. The results showed that the subcooling point of red palm weevil decreased with the development of insect states, and the average subcooling points of egg, first instar larva, fifth instar larva, ninth instar larva and adult were -5.92 and -6.42, -7.19, -7.43 and -11.84 ℃, the order of descending order of supercooling is: egg> larva> adult. At the time of 6, 24, 48 and 72h treatment, there was a significant or extremely significant logistic regression between the low temperature and the survival rate. The half lethal temperature (Ltemp50) increased with the prolongation of treatment time. The Ltemp50 between eggs, 1st instar larvae, 5th instar larvae, 9th instar larvae and adult worms was 1.61, -1.67, -2.39, -2.40 and -0.40 ℃ after 72h treatment, respectively. The order is: egg