芬兰真绥螨对截形叶螨的捕食功能研究  

Predation of Euseius finlandicus on Tetranychus truncatus

作　　者：郑开福[1] 沈慧敏[1] 张新虎[1] 

机构地区：[1]甘肃农业大学草业学院,兰州730070

出　　处：《应用昆虫学报》2013年第2期401-405,共5页Chinese Journal of Applied Entomology

基　　金：公益性行业(农业)科研专项(201103020;200903032)

摘　　要：本文研究了芬兰真绥螨Euseius finlandicus Oudemans对截形叶螨Tetranychus truncatus Ehara的捕食作用。结果表明，芬兰真绥螨对截形叶螨雌成螨非嗜食，对卵和若螨嗜食。在RH80％±5％，温度分别为16、20、24、28和32℃的试验条件下，芬兰真绥螨对截形叶螨各螨态的捕食功能反应均属于HollingⅡ型。在16～28℃温度范围内，芬兰真绥螨对截形叶螨各螨态的攻击系数、捕食能力、最大日捕食量均随温度升高而增加，处理时间则缩短，温度高于28℃时捕食量开始减小。截形叶螨密度固定时，芬兰真绥螨的平均捕食量随其自身密度的增加而逐渐降低。Predation of Euseius finlandicus （Oudemans） on three stages （adult females, nymphs and eggs） of Tetranychus truncatus （Ehara） was examined at five constant temperatures （16, 20, 24, 28 and 32% ） under laboratory conditions with RH 80 ＋ 5%. Euseius finlandicus was found to prefer eggs and nymphs to adult females of T. truncatus. The predator＇ s functional response to prey density at these temperatures could be modeled as Holling type Ⅱ. Through the temperature range of 16 -28℃ , the attack index, the a/Th value and the maximum predatory number all increased with increasing temperature whereas the average treatment time was reduced. The maximum predatory number decreased at temperatures above 28℃. With a fixed number of prey available, predation rate per predator decreased with increasing predator density through mutual competition and interference.

关 键 词：芬兰真绥螨 截形叶螨 功能反应 

分 类 号：S476.2[农业科学—农业昆虫与害虫防治]