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研究和实践证明,把某些作物通过间作、套种或混种等形式合理搭配种植,往往可以控制或减轻某些病虫害的发生,从而收到“不施农药,胜施农药”的效果。1麦棉套种这种配植方法对控制棉花苗期蚜虫十分有利。麦套棉由于小麦的屏障作用,不仅直接影响棉蚜迁入,而且棉田温度要比单作田低l℃左右,再加上麦行天敌的作用,苗蚜不用施药防治即可控制为害。据山东省1988年4处试验点观察,全年不治虫,单作棉田平均减产31.3%,麦套棉田平均减产18.1%,少减产42.2%。2麦烟套作由于麦株能阻碍烟蚜迁飞降落,再加上麦田七星瓢虫等天敌的作用,可以有效控
Research and practice have proved that it is often possible to control or mitigate the occurrence of some pests and diseases through the rational collocation of some crops through intercropping, intercropping or intercropping, thus receiving the effect of “not applying pesticides and winning pesticides.” 1 cotton intercropping This method of planting cotton aphids control of the seedling is very favorable. Wheat wheat cotton barrier effect, not only directly affect the cotton aphid immigration, and the cotton field temperature is lower than the single field about l ℃, coupled with the role of the wheat line natural enemies, seedling aphids can be controlled without pesticide damage control. According to Shandong Province in 1988 observed at the four pilot sites, pest control throughout the year, an average of 31.3% reduction of cotton fields, wheat cotton fields on average yield reduction of 18.1%, 42.2% less yield. 2 wheat smoke as a result of wheat sheaths can hinder the flight aphids landing, coupled with natural enemies such as Coccinella septempunctata can effectively control