新疆玉米害螨天敌种类及其优势种天敌控害效应研究

Preliminary Studies on Vraieties of Natural Enemies and Predatory Effect of Stethorus punctillum Weise in Corn Field in Xinjiang

广泛调查新疆主要玉米产区 ,采集标本 ,鉴定出新疆玉米害螨的天敌有 2纲 12科 2 8种。其中深点食螨瓢 (StethoruspunctillumWeise)为优势种天敌 ,经室内对深点食螨瓢捕食新疆玉米叶螨优势种截形叶螨 (Tetrany chustruncatesEhara)的功能反应研究 ,成虫和幼虫均有较强的捕食能力 ,其中深点食螨瓢成虫对截形叶螨卵、若螨和成螨捕食量分别为 :41 5 8、3 6 2 7和 2 8 2 5头 ,其功能反应符合HollingⅡ。

Based on systematic and wide investigation and preliminary identification,there are twenty eight species of natural enemies in corn field in Xinjiang which belong seven orders and twelve families. Stethorus punctillum Weise is dominant natural enemies of maize spider mites. Study on predatory effect of Stethorus punctillum Weise on Tetranychus truncates Ehara in corn field which is predominant maize spider mite of Xinjiang was conducted. The result showed that the predatory functional response of Stethorus punctillum Weise to Tetranychus truncates Ehara belong to HollingⅡresponse,adult respectively prey on 36.27larvaes,28.25adults and 41.58 eggs of T.truncates Ehara , per day it has strong control to the maize spider mite.