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文献资料中记载核桃长足象成虫越冬场所多在草丛、树干裂缝及土壤中。但在低海拔地区,笔者在上述场所并未能找到越冬成虫。在常规场所调查的基础上,铺设帆布地垫调查越冬成虫下树情况,观察记载调查期内气温并在实验室进行低温试验。在3个调查期内的同月份平均气温相差不大,最低气温-2℃,平均最低气温都在3℃以上。在2~8℃的冷藏室内核桃长足象成虫的存活率最高,为100%,在0℃至-7℃的变温室环境中,最大存活率为96%。调查结果表明,越冬成虫主要分布在核桃树冠上部的芽苞处和叶柄处,两处所占比例接近1∶1,东南方向的核桃长足象明显多于其他方位的越冬成虫。
The literature records that walnuts grow as long as the overwintering habitat in the grass, trunk cracks and soil. However, at low altitude, the author failed to find overwintering adult in these places. On the basis of the survey of conventional sites, lay the canvas mats to survey the condition of the overwintering adult trees, observe and record the temperature during the survey period and conduct the low-temperature test in the laboratory. During the three survey periods, the average temperature in the same month did not differ much. The minimum temperature was -2 ℃ and the average minimum temperature was above 3 ℃. The survival rate of adult wallichida adults in the refrigerated room at 2 ~ 8 ℃ was the highest at 100%. The maximum survival rate was 96% in the environment of 0 ℃ -7 ℃. The results showed that the overwintering adults were mainly distributed in the bud buds and petioles at the upper part of the walnut crown, with the ratio of the two being close to 1: 1. The southeast long-walled walnut was significantly longer than the other oriental winged adults.