黏虫幼虫和蛹过冷却点及结冰点的测定  

Supercooling points and freezing points of the larvae and pupae of Mythimna separata Walker

作　　者：段云[1] 巩中军[1] 李慧玲[1] 苗进[1] 蒋月丽[1] 李彤[1] 武予清[1] 

机构地区：[1]河南省农业科学院植物保护研究所,河南省农作物病虫害防治重点实验室,农业部华北南部有害生物治理重点实验室,郑州450002

出　　处：《植物保护》2016年第4期147-150,156,共5页Plant Protection

基　　金：公益性行业(农业)科研专项(201403031);国家现代农业产业技术体系(CARS-03)

摘　　要：为初步探明黏虫的耐寒能力,对室内饲养黏虫不同发育阶段的过冷却点和结冰点进行了测定,并分析了蛹期过冷却点和结冰点与性别及蛹重的关系。结果表明,黏虫不同发育阶段的过冷却点和结冰点都存在一定程度的差异。幼虫期过冷却点和结冰点的平均值分别为-4.79℃和-1.57℃;蛹期过冷却点和结冰点的平均值分别为-14.05℃和-6.12℃。幼虫的过冷却点随龄期增加逐渐升高,即4龄幼虫(-6.23℃)<5龄幼虫(-4.38℃)<6龄幼虫(-3.58℃)。蛹期的过冷却点和结冰点存在日龄和性别上的差异,但与蛹重无明显的相关性。本研究表明,黏虫蛹的耐寒性强于幼虫。The supercooling points （SCP） and freezing points （FP） of laboratory-reared Mythimna separata （Walker） at different developmental stages were determined as the indexes of its cold hardiness. The relationships between SCP/FP of pupae and sex, as well as pupae weight were analyzed. The results showed that SCP and FP of M. separata varied among different developmental stages. The average temperatures of SCP and FP for larvae （4th to 6th instars） were -4.79℃ and -1.57℃, respectively, and those for pupae （1-day, 3-days and 5-days old pupae） were -14.05℃ and -6.12℃, respectively. SCP of larvae increased gradually with age, with the order of 4th instar larvae （-6.23℃） 〈 5th instar larvae （-4.38℃） % 6th instar larvae （-3.58℃）. The SCP/FP of pupae were different in different sex and different days of age. However, there was no correlation between SCP/FP and pupa weight. These results showed that pupae of M. separata are more tolerant to coldness than larvae.

关 键 词：黏虫 抗寒性 过冷却点 结冰点 

分 类 号：S186[农业科学—农业基础科学] S433.4