土耳其斯坦叶螨和截形叶螨生殖力比较

The Comparison on Fecundity of Tetranychus turkestani and Tetranychus truncatus

在25±0.5℃的条件下,应用岛屿法观察比较了土耳其斯坦叶螨Tetranychus turkestani和截形叶螨Tetranychus truncatus实验种群的存活率、产卵量,组建了土耳其斯坦叶螨和截形叶螨生殖力表特定年龄生命表,比较了2种群净增殖率(R0)、内禀增长率(rm)、周限增长率(λ)和种群翻倍时间(t)等生殖力参数以及种群增长指数(I)。从结果看,截形叶螨的生殖能力和种群增长指数低于土耳其斯坦叶螨。因此,可以判断截形叶螨在新疆部分棉田取代土耳其斯坦叶螨种群爆发成灾,并非其物种本身生殖潜能形成,而是由其它生态因子造成。由于截形叶螨存活时间长于土耳其斯坦叶螨,其一旦进入棉田,则造成更大危害。

The fecundity table of Tetranychus turkestani and Tetranychus trutncatus reared with cotton leaf disk were constructed at 25 ℃. We observed survial rate and fecundity, compared fecundity parameters such as net reproduction rate（R0）, intrinsic rate of increase（rm）, finite rate of increase （λ）, population doule time （t）, trend index of population （I） .The results indicated that the fecundity and trend index of population of T. trutncatus were lower than that of T. turkestani. As a result, we can estimate the factors that cause the outbreak of T. trutncatus on cotton field is not its fecundity potential but others. As life time of T. trutncatus wwas longer than T. turkestani, it can cause more damage once it came into cotton filed.