摘要
陕西渭南地区棉虫的主要天敌有4大类:蜘蛛、瓢虫、食虫蝽和草蛉,以蜘蛛类为最重要。在棉田按每亩120～150株插种玉米,天敌虫口大量增加。插种玉米的棉田天敌数较对照纯棉田增加了62.8～115.7％。对棉铃虫、伏蚜、盲蝽和红铃虫均有明显的控制作用。棉田插种玉米可以诱捕棉铃虫成虫,从而减少第二代该虫产卵,减轻棉花被害。
Spiders, coccinellids, predatory bugs and lacewings are the four major groups of natural enemies of cotton pests in Weinan area, Shaanxi Province, spiders being the most important group. Field studies showed that interplanting corn at 120-150 plants per mu in cotton fieldsincreased natural enemy populations by 62.8-115.7%, compared with the control fields. This Strategy showed an obvious effect of controlling cotton bollworm, aphids, mirid bugs andcotton pink bollworm. Interplanting com in cotton fields could trap Heliothis moths so as to reduce the second generation eggs and the damages on cotton.
关键词
棉田
间作
玉米
天敌
控制
害虫
interplanting cotton pests cultural control natural enemy population
