大草蛉对草地贪夜蛾低龄幼虫的捕食功能评价  

Evaluation of predatory function of Chrysopa pallens to larvae of fall armyworm Spodoptera frugiperda

作　　者：曹雯星 张韬 杨欢[1] 徐自强 顾俊杰 陈红星 CAO Wenxing;ZHANG Tao;YANG Huan;XU Ziqing;GU Junjie;CHEN Hongxing(College of Agronomy,Sichuan Agricultural University,Chengdu 611130,Sichuan Province,China)

机构地区：[1]四川农业大学农学院,成都611130

出　　处：《植物保护学报》2020年第4期839-844,共6页Journal of Plant Protection

基　　金：四川省特别人才支持计划。

摘　　要：为评价大草蛉Chrysopa pallens对草地贪夜蛾Spodoptera frugiperda低龄幼虫的捕食功能,在室内条件下观察大草蛉对草地贪夜蛾幼虫的捕食行为,并设置不同密度的草地贪夜蛾1~3龄幼虫供大草蛉成虫取食,测定其对草地贪夜蛾1~3龄幼虫的捕食效能。结果表明,大草蛉成虫对草地贪夜蛾低龄幼虫的捕食功能反应符合Holling-模型,对草地贪夜蛾1、2和3龄幼虫的瞬时攻击率分别为1.023、0.618、0.313,处理时间分别为0.070、0.097、0.305 d,日最大捕食量分别为14.37、10.31、3.28头;大草蛉成虫的搜寻效应随着草地贪夜蛾幼虫密度的增加而降低,干扰作用随着大草蛉自身密度的增加而加强,且在草地贪夜蛾幼虫不同龄期,大草蛉自身密度对其捕食能力的干扰作用不同,幼虫为1龄时,大草蛉自身密度对其捕食能力的干扰作用最大,幼虫为2、3龄时的干扰作用次之。表明大草蛉成虫对草地贪夜蛾低龄幼虫具有较好的捕食作用,可作为有效防控草地贪夜蛾的备选天敌资源。In order to evaluate the predatory function of Chrysopa pallens against young larvae of fall armyworm Spodoptera frugiperda, the predation behavior of C. pallens on S. frugiperda larvae in the laboratory was observed. Different densities of the 1 st-3 rd-instar larvae of S. frugiperda were set for lacewing adults, and the predatory function of C. pallens adults against S. frugiperda larvae was measured. The results showed that the predatory response of C. pallens adults to the larvae of S. frugiperda was fitted the Holling-model;the instantaneous attack rates of C. pallens to the 1 st-, 2 nd-and 3 rd-instar larvae of S. frugiperda were 1.023, 0.618 and 0.313, respectively;the handling times were 0.070,0.097 and 0.305 d, respectively, and the maximum daily predation amounts were 14.37, 10.31 and 3.28,respectively. The searching efficiency of C. pallens adults decreased with increasing density of S. frugiperda larvae, and the interference effect increased with increasing density of C. pallens;the density of C. pallens had different interference effects on its predatory ability for different instars of prey: the density of C. pallens showed the greatest interference effect on its predatory ability against the 1 st-instar preys, followed by the 2 nd-instars and 3 rd-instars. It indicated that C. pallens adults had a good predatory effect on young larvae of S. frugiperda and can be used as an alternative natural enemy resource for controlling S. frugiperda.

关 键 词：草地贪夜蛾 大草蛉 捕食行为 功能反应 

分 类 号：S476.2[农业科学—农业昆虫与害虫防治]