论文部分内容阅读
1997～ 1999年通过对新疆玛纳斯县粮棉混作生态区天敌的群落转移及数量变动规律的系统调查 ,初步摸清了新疆北部粮棉混作区天敌群落的组成及优势种天敌、以及天敌与害虫发生之间的关系 ,结果表明 ,北疆粮棉混作区天敌群落以捕食性天敌为主 ,天敌种类主要有蜘蛛类、捕食甲类、食虫蝽类、草蛉类、瓢虫类、寄生蜂类、食蚜蝇类等。春季 4月上旬至 5月上旬越冬后天敌主要分布于麦田 ,少量分布于林带、果园及田埂渠道上早发的多年生杂草上 ,如田旋花及禾本科杂草早熟禾等。 5月下旬麦田天敌大量向棉田、玉米田转移 ,在棉田经大量繁殖后 ,于 7月上旬达到高峰 ,7月中、下旬逐渐外迁至多年生果园、复播作物、杂草、林带准备越冬 ,9月下旬至 10月上旬冬麦出苗后 ,部分天敌迁入冬麦田越冬。
From 1997 to 1999, by systematically investigating the community transfer and quantity fluctuation of natural enemies in the agro-ecological mixed zone of Manas County in Xinjiang, the composition and natural enemies of natural enemy communities in the grain and cotton mixed area in northern Xinjiang were tentatively found out, The results showed that predatory natural enemies were predominated in the natural enemies community in the cotton-cotton mixed area in north Xinjiang. The main natural enemies were arachnids, predators A, bugs, ladybugs, ladybugs, parasitism Bee, hoverfly and so on. During the early spring of April to early May, the natural enemies were mainly distributed in the wheat fields after being wintering, and a few were distributed in the perennial weeds with early rotation on the forest belts, orchards and fields, such as Convolvulaceae and Poaceae weeds. In late May, a large number of natural enemies of wheat fields shifted to cotton fields and corn fields. After large numbers of cotton fields multiplied, they peaked in early July and gradually migrated to perennial orchards in the middle and late July. In late September to early October after winter wheat emerges, some natural enemies move into the winter wheat field to winter.