不同温度下鞍形花蟹蛛亚成蛛对茶尺蠖3日龄幼虫的捕食功能

鞍形花蟹蛛（Xysticus ephippiatus Simon）是茶园害虫的重要捕食性天敌,为了明确它对茶尺蠖（Ectropis obliqua Prout）的控制能力,在20、25、30℃ 3种不同温度条件下,研究了鞍形花蟹蛛亚成蛛对茶尺蠖3日龄（1龄末2龄初）幼虫的捕食反应。结果表明,鞍形花蟹蛛雌蛛和雄蛛对茶尺蠖3日龄幼虫的捕食功能反应均符合HollingⅡ型方程,在相同温度下,捕食量随着猎物密度的增大而增加。在25℃和30℃时,雌虫的捕食上限均为68头;雄虫的捕食上限以30℃时最大,为67头。相同条件下雌、雄蛛之间的捕食量没有明显差别,而温度对鞍形花蟹蛛的捕食量有明显影响。

Predatory Response of Penultimate-instar Xysticus ephippiatus Simon on 3-day-old Larval of Tea Loopers under Different Temperatures

Xysticus ephippiatus Simon is one of important predatory enemies in tea plantation. The predation of penultimate-instar X. ephippiatus on 3-day-old larval of tea loopers (late first- and early second-instar) Ectropis obliqua Prout was studied under different temperatures in order to investigate the control efficiency on the tea looper. The results showed that all the functional responses could be described with Holling II equation under the three different temperatures. At the same temperature, the predation capacity of X. ephippiatus on tea loopers increased with the increasing density of the prey. The maximal predation of female was 68 individuals/d at 25℃and 30℃. The maximal predation of male was 67 individuals/d at 30℃. When the temperature and the density of the prey were same, the predation was no difference between female and male. But the temperature could affect the predation.