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在棉苗期,害虫及其天敌陆续进入棉田,应以保护或利用天敌灭虫为重点,力争6月20日以前,棉田不用药或少用药,使田间有大量天敌群落存在,伏蚜与棉铃虫不发生或轻发生。 (一)开展以瓢治蚜:5月10日、20日分别在各个类型的麦田、油菜、苜蓿地普查瓢源两次,估计出当年移植瓢虫治蚜的时期、面积和主要瓢源的采集地。凡向阳地、旱地、历年麦蚜较重地区,显然是瓢源较多处所。通常需要8-10人编成一组采捕,一人收,一人运送,一人在棉田释放。先将捕虫网或瓶罐、盆等采来的瓢虫,暂放在有树叶的麻袋内。这时如瓢虫
In the cotton seedling stage, pests and their natural enemies enter the cotton fields one by one, and should focus on the protection or use of natural enemies and pest control. By June 20, no or less drugs should be used in the cotton fields so that there will be a large number of natural enemy communities in the cotton fields. Insects do not occur or occur lightly. (A) to carry out scoop governance aphids: May 10, 20, respectively, in all types of wheat, rape, alfalfa calabash census twice to estimate the year when the ladybug transplanting aphids era, area and the main scoop Collecting place. Where sunny, dry land, wheat aphid over the calendar area, apparently the scoop source more premises. It usually takes 8-10 people to compile a collection, one person receives one person for delivery, and one person is released in the cotton field. First insect net or bottles, pots and other ladybugs, temporarily put in a sack with leaves. At this time, such as ladybugs