辽宁三种松毛虫越冬幼虫过冷却点的研究  

STUDY ON THE SUPER-COOLING POINT OF THE OVERWINTERING LARVAE OF THREE KINDS OF PINE CATERPILLAR

作　　者：夏瑞心[1] 徐丽华[1] 

机构地区：[1]辽宁省林业科学研究院,沈阳110032

出　　处：《林业科学》1993年第2期186-189,共4页Scientia Silvae Sinicae

摘　　要：松毛虫越冬幼虫在越冬期间的存活率,除了取决于种的生物学特性而外,还取决于低温的强度、出现的时间、持续时间的长短等。冬季的最低温度不仅是决定三种松毛虫分布地区的重要原因,而且左右着松毛虫数量的变化。决定着冬眠幼虫能否存活和存活多少。尤其是越冬开始及越冬结束时,气候变化,影响最为显著。When the insect internal water changes the critical point of temperatureinto solid state, can reduce to very low extent. According to this physicalproperty, we measured the super-cooling point and freezing point of hiberna-ting and anabiotic larvae of three kinds of pine caterpillar under low tempera-ture with semiconductor point temperature meter. We also made some lethal testswith the change of temperature at the beginning and the end of hioernationof the pests. The results are as follows:1. The super-cooling points of hibernating larvae and anabiotic larvae of De-ndrolimus superans are -21.89 ±0.31 and -13.18±0.39; that of D. tabulaef-ormis are -19.89±0.48 and -11.12±0.29; and that of D. spectabilis are-18.23±0.51, -9.14±0.27.2. The freezing points of hibernating larvae and anabiotic larvae of D. sup-erans are -6.66±0.36 and -5.18±0.22; that of D. tabulaeformis are -6.53±0.39 and - 4.61±0.21; and that of D. spectabilis are -6. 27±0.32 and-3.25±0.18. At the beginning and the end of hibernating, if the climate changesvery abruptly, then the temperature changes from 5℃--6℃ frequantly andthe mortality of the overwintering larvae may be more than 90%.

关 键 词：松毛虫 越冬 幼虫 过冷却点 

分 类 号：S763.712.4[农业科学—森林保护学]