近年来,随着西瓜种植面积的扩大。耕作制度的变化及连作种植,致使西瓜田生物群落发生了较大的变化。新害虫的出现,次要害虫种群数量的上升,更加重了对西瓜的危害,增加了防治的难度。为此,协作组于1987—1990年在郑州、开封、周口等西瓜主要产区,进行了西瓜害虫药剂防治多点小区 In recent years, with the expansion of watermelon cultivation. Farming system changes and continuous cropping, resulting in watermelon field biome have undergone major changes. The emergence of new pests, the increase in the number of secondary pests, but also more serious harm to watermelon, increasing the difficulty of prevention and treatment. To this end, the collaborative group in 1987-1990 in Zhengzhou, Kaifeng, Zhoukou and other watermelon main producing areas for watermelon pest control multi-point cell