不同虫态叉角厉蝽对草地贪夜蛾幼虫的室内捕食作用

为了明确叉角厉蝽 Eocanthecona furcellate (Wolff)对草地贪夜蛾 Spodoptera frugiperda (J.E.Smith)幼虫的控制作用，在实验室条件下测定了叉角厉蝽不同虫态对草地贪夜蛾不同龄期幼虫的捕食能力，研究了该蝽捕食功能反应、搜寻效应以及种内干扰作用。结果表明，叉角厉蝽3龄若虫、5龄若虫、成虫均可捕食草地贪夜蛾幼虫，总体呈现叉角厉蝽低龄若虫捕食草地贪夜蛾低龄幼虫的数量较多，高龄若虫和成虫捕食中间龄期幼虫数量较多的规律；叉角厉蝽3个虫态对草地贪夜蛾2~3龄幼虫的捕食功能反应均符合Holling II方程和HollingⅢ型功能反应新模型；5龄若虫对草地贪夜蛾2~3龄幼虫的捕食效能(a/Th)最强（214.0）、日最大捕食量(1/Th)最大（256.4头）。不同虫态叉角厉蝽的搜寻效应与草地贪夜蛾密度均呈负相关。建立了叉角厉蝽成虫密度、草地贪夜蛾4龄幼虫密度对捕食作用的干扰反应方程，干扰作用发生后该蝽的平均捕食量和捕食作用率均逐渐下降。本研究结果可为田间释放叉角厉蝽防治草地贪夜蛾提供依据。

Functional response of different stage of Eocanthecona furcellate (Wolff) preying on Spodoptera frugiperda (J.E.Smith) larvae in the laboratory

In order to clarify the control effect of stinkbug Eocanthecona furcellate (Wolff) on the moth Spodoptera frugiperda (J.E.Smith) larvae, the predation ability of 3 stages of E. furcellate on different instar larvae of S. frugiperda was measured under laboratory conditions, and the predator-prey functional response, searching effect and intraspecific interference effect were studied based on the collected data. The results showed that 3rd instar nymphs, 5th instar nymphs and adults of E. furcellate could prey on the larvae of S. frugiperda. In general, the number of the small instar larvae predated by the young nymphs was more, and the number of middle instar larvae was more preyed on by the aged nymphs and adults. The predatory functional responses of the three stinkbug stages to the 2nd ~3rd instar larvae of the moth were in accordance with Holling II equation and Holling type III functional response model. The predation efficiency (a/Th) of the 5th instar nymph of E.furcellate on the 2nd~3rd instar larvae of the moth was the highest (214.0), and the daily maximum predation (1/Th) was the highest (256.4).The searching efficiency of three stinkbug stages of E.furcellate was negatively correlated with its prey density. The interference response equation for the stink bug adult density and the moth 4th instar larva density on predation was established, and the average predation amount and predation rate of the stink bug decreased gradually after the interference presented. The results can provide a basis and guide for releasing E. furcellate to control S. frugiperda in the fields.