桔园三种天敌对桔全爪螨的捕食作用

本文运用二次通用旋转组合设计方法，研究了束管食螨瓢虫（ＳｔｅｔｈｏｒｕｓｃｈｅｎｇｉＳａＳａｊｉ）、尼氏钝绥螨（ＡｍｂｌｙｓｅｉｕｓｎｉｃｈｏｌｓｉＥｈａｒａｅｔＬｅｅ）、草间小黑蛛（ＥｒｉｇｏａｉｄｉｕｍｇｒａｍｉｎｉｃｏｌｕｍＳｕｎｄｅｖａｌｌ）与桔全爪螨（ＰａｎｏｎｙｃｈｕｓｃｉｔｒｉＭｃＧｒｅｇｏｒ）共存系统捕食量的数学模型，对捕食量模型的分析表明３种天敌中以草间小黑蛛的捕食作用最大；在不同密度组合下，天敌间作用形式不同．最后本文还讨论了不同猎物密度下３种天敌发挥最大控制作用的密度组合．

PREDATION OF THREE NATURAL ENEMIES IN CITRUS ORCHARD TO CITRUS RED MITE (PANONYCHUS CITRI MCGREGOR)

Mathematic model of the number preyed in co-existent. system of Stethorus chengi SaSaji, Amblyseius micholsi Ehara et Lee, Erigonidium graminicolum Sundevall and citrus red mite (Panonychus citri McGregor) was established by composite design of quadratic common rotation of four factors. The regression eqution was given as follows,Y = 17.4287 + 1 .6667P 1 + 0.4167p2 + 0.5000P 3 + 1 1 .2500X - 0.2500P 1 P2 + P 1 X+ 0.3573P2P 3 + 0.1250P2X - 0.1250p3 X - 1 .4821p - 0.9821p - 0.6071P + 3.5179X2.The interaction response surface and the principal component analysis method were used to evaluate predations and interactions in co-existent system. The results showed maximum predation caused by E. graminicolum in three natural enemies, and the way of action among predators varied with combination of their densities. Finally, best combinations of three predators were discussed in different prey densities