湿度对三角新小卷蛾实验种群生长的影响

在相对湿度(RH)为55%、65%、75%、85%和95%条件下,观察湿度对三角新小卷蛾Olethreutes leucaspis Meyrick各虫态生长、发育及存活的影响,组建三角新小卷蛾实验种群生命表。结果表明:在RH为55%-95%条件下,三角新小卷蛾卵、幼虫、蛹和世代的发育历期在RH为85%时最短,发育历期分别为1.67、12.46、7.67和25.42 d。高湿条件下卵、幼虫和蛹的存活率较高。三角新小卷蛾各虫态发育历期、存活率与相对湿度呈抛物线关系。在RH为55%-95%条件下该虫内禀增长力(rm)均大于0,种群趋势指数(I)均大于1,该虫种群呈增长趋势。三角新小卷蛾发育适宜的RH为75%。

Influence of relative humidity on the experimental population of Olethreutes leucaspis

At different relative humidity(RH) conditions in the range of 55%-95%,effect of RH on the growth,development,and survival of various stages of Olethreutes leucaspis Meyrick were observed,their life table of experiment population were set up.The results showed that: in the range of 55%-95% RH,developmental duration of egg,larva,pupae,generation were the shortest at 85% RH,the duration was 1.67,12.46,7.67,and 25.42 d,respectively.The survival rates of egg,larva and pupae under higher humidity conditions were considerably higher.The relationships of the developmental duration,survival rate of each stage to RH were described as parabolas.The innate capacity of natural increase(rm) was larger than 0,and the population trend index(I) was larger than 1,the population of O.leucaspis was increase in the range of 55%-95% RH.The suitable relative humidity for development of O.leucaspis was 75%.