Queiroz Obiratanea S, Ramos Rodrigo S, Gontijo Lessando M, Picanço Marcelo C
Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG 36570-000, Brazil.
Instituto de Ciências Agrárias, Universidade Federal de Viçosa - Campus Florestal, Florestal, MG 35690-000, Brazil. Corresponding author, e-mail:
Environ Entomol. 2015 Apr;44(2):246-51. doi: 10.1093/ee/nvu026. Epub 2015 Jan 30.
The functional response and predation parameters of three species of predatory pirate bugs Amphiareus constrictus (Stal), Blaptostethus pallescens Poppius, and Orius tristicolor (White) (Hemiptera: Anthocoridae) were evaluated at four different densities of eggs of Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Experiments were conducted in Petri dishes containing a tomato leaf disk infested with the pest eggs, and maintained inside growth chamber with environmental conditions of 25 ± 2 °C, 70 ± 10% relative humidity, and a photoperiod of 12:12 (L:D) h. A. constrictus and B. pallescens showed a type III functional response where predation increased at a decreasing rate after egg density was higher than 12 per leaf disk, reaching an upper plateau of 18.86 and 25.42 eggs per 24 hours, respectively. By contrast, O. tristicolor showed a type II functional response where the number of eggs preyed upon increased at a decreasing rate as egg density increased, reaching an upper limit of 15.20 eggs per 24 hours. The predator equations used in this study estimated handling time of 1.25, 0.87, 0.96 h for A. constrictus, B. pallescens, and O. tristicolor, respectively. The lower handling time and possible higher attack rate of B. pallescens suggests a higher efficiency and probably greater impact on the pest population. If conservation or classical biological control of T. absoluta is to be implemented, then prioritizing which natural enemy species is the most efficient is an important first step.
在四种不同密度的番茄潜叶蛾（麦蛾科：鳞翅目）卵上，评估了三种捕食性花蝽（窄姬猎蝽（斯塔尔）、淡色姬猎蝽、三色小花蝽（怀特），半翅目：花蝽科）的功能反应和捕食参数。实验在装有被害虫卵侵染的番茄叶盘的培养皿中进行，并置于生长室内，环境条件为25±2℃、相对湿度70±10%、光周期12:12（光照：黑暗）小时。窄姬猎蝽和淡色姬猎蝽表现出III型功能反应，即卵密度高于每叶盘12个后，捕食量以递减速率增加，分别达到每24小时18.86个和25.42个的上限。相比之下，三色小花蝽表现出II型功能反应，即随着卵密度增加，被捕食的卵数量以递减速率增加，达到每24小时15.20个的上限。本研究中使用的捕食者方程估计，窄姬猎蝽、淡色姬猎蝽和三色小花蝽的处理时间分别为1.25、0.87、0.96小时。淡色姬猎蝽较低的处理时间和可能较高的攻击率表明其效率更高，可能对害虫种群的影响更大。如果要实施番茄潜叶蛾的保护或经典生物防治，那么优先确定哪种天敌物种效率最高是重要的第一步。
