摘要
赤松毛虫 (Dendrolimusspectabilis)越冬幼虫在鲁中山区以 5龄为优势龄期 ;以树干 2m以下的树皮裂缝以及树盘根际周围 5 0cm以内的杂草、石块等处为主要越冬场所 ;幼虫下树越冬期集中在 11月上旬、出蛰上树期集中在 3月中、下旬 ;测定越冬幼虫的过冷却点以 1、2月最低 ,分别为 - 19.94℃和 - 19.30℃ ,10月和 4月最高 ,分别为 - 8.6 7℃和 - 9.0 4℃。越冬幼虫死亡率以 11月下旬和 3月下旬最高 ,分别为 2 3.3%和 18.0 % ,最终死亡率为5 9.3%。气温变化影响幼虫的抗寒能力。
The study results shows that the insect of Dendrolimus spectabilis overwmter mainly in the from 5th instar. They survive bark cracks below 2m of the trunk as well as grass and stone within 50cm around the trunk,etc.The insects come down for overwintering in the middle of November and go up tree in the middle and or later of March..The lowest temperature points for super-cooling became the lowest during Jan. and Feb, ranging between -19.94℃ and -19.30℃ and the highest temperature point appears in Oct. and Apr. ,romging between -8.67℃ and -9.04℃.The death rate of overwintering carve was highest in the last ten days in Nov. and next Mar respectively.,which are 23.3% and 18.0% respectively.The total death rate was 59.3% during winter?The changing temperature affects the cold vesistance of the insects.
出处
《山东农业大学学报（自然科学版）》
CSCD
北大核心
2003年第3期315-320,共6页
Journal of Shandong Agricultural University：Natural Science Edition
基金
山东农业大学博士基金项目
关键词
赤松毛虫
越冬幼虫
抗寒性
越冬龄期
过冷却点
Dendrolimus spectabilis, over-winter instar,Cold-Resistance, super-cooling point,
