果树红蜘蛛是果树上的重要害虫之一，近几年我们引导果农采用“三看一洗”法防治，收到了事升功倍的效果。具体内容是：一行红蜘蛛发生量（即防治指标），平均每百叶有红蜘蛛5O0～80O头，应立即开展防治。二看天敌数量，当天敌与红蜘蛛数量比例为1：20～25以下时，天敌就能发挥 Fruit tree Red spider is one of the important pests on fruit trees. In recent years, we have led the farmers to adopt the “three-look-and-wash” method to prevent and control the diseases. The specific content is: a line of spider mite occurrence (that is, prevention and control indicators), an average of 100 per cent of red spider has 50 ~ 80O head, should immediately carry out prevention and treatment. Second look at the number of natural enemies, when the natural enemy and the number of spider mongolian 1: 20 ~ 25 below, the natural enemy will be able to play