棉红叶螨是粮棉作物的主要害螨,因耕作制度不同,各种作物茬口间,红叶螨的发生危害轻重不一。在我市1985年以前棉红叶螨发生面积较大,对棉花、玉米危害较重,每年需防治1—2次。在当时普遍种植玉米间作棉花,前茬播种蚕豆或小麦,后茬套种玉米,在玉米行间大多播种棵间黄豆。这种种植方式使叶螨食料丰富,尤其是在黄豆上的繁殖速度,可高出 Cotton leaf spider mite is the main pest mites, grain and cotton crops, due to different tillage systems, crop stubble, the occurrence of spar Mites hazards vary in severity. In our city before 1985 cotton spider mite occurred in a larger area, the damage to cotton, corn, heavier, 1-2 times a year to be controlled. At that time, corn was commonly planted as cotton, and the beans or wheat were sowed in the preceding crop and the corn was planted in the following crop. Most of the sowing seeds were planted between the rows of corn. This planting method makes spider mites food-rich, especially in the propagation rate of soybean can be higher