天敌对新疆麦双尾蚜的控制作用

在新疆塔城和哈密春麦田，用笼罩法研究的结果表明，7月份天敌因素对麦双尾蚜Diuraphis noxia (Mordvilko) 自然种群具有明显的控制作用。在试验观察期间，当部分自然种群出现负增长时，笼罩的麦双尾蚜增长了4.4～8.3倍。塔城春麦田天敌数量变化和麦双尾蚜增长率的相关性分析表明，1994年蚜小蜂Aphelinus albipodus和斑腹蝇Leucopisannulipes等天敌的控制能力明显，1996年捕食性的蜘蛛类、瓢虫类天敌作用较强。不同年份天敌优势种类和数量存在明显差异。

IMPACT OF NATURAL ENEMIES ON RUSSIAN WHEAT APHID IN XINJIANG UYGUR AUTONOMOUS REGION

The natural enemies were evaluated for their effects on the Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), in spring wheat field in Tacheng and Hami, Xinjiang Uygure Autonomous Region. The aphid number increased 4.4～8.3 times in the caged spring wheat seedlings compared with that in the uncaged plants in July. In Tacheng spring wheat field, Leucopis annulipes and Aphelinus albipodus showed greater suppressive effects on the increase rates of RWA than other natural enemies did in 1994 according to correlation and path analyses. Spiders and coccinellids, however, played more important role in controlling the aphid in 1996.