红蜘蛛是为害果树叶子的害虫,其中发生最普遍的是山楂红蜘蛛、苹果红蜘蛛和苜蓿红蜘蛛。这三种红蜘蛛对苹果、梨、桃、李、杏和山楂等果树都普遍为害,轻者影响果树生长,重者造成落叶,严重威胁果树生长。由于红蜘蛛的种类多,生活习性各异,一年可以发生几代,繁殖快,为害重,给防治工作带来很大困难。过去这里,一年打七、八次剧毒农药,仍不能奏效。且增强了害虫的抗药性,一年比一年为害猖獗,还污染了环境,杀伤了天敌, Spider mites are the pests responsible for the leaves of fruit trees, the most common of which are the hawthorn spider, the apple spider and the alfalfa spider. These three kinds of red spider on apple, pear, peach, plum, apricot and hawthorn and other fruit trees are generally harmful, the light affect the growth of fruit trees, severe cases of deciduous leaves, a serious threat to the growth of fruit trees. Due to the variety of spider mites, different habits and habits, several generations can occur a year, multiply quickly and seriously, which brings great difficulties to prevention and control work. In the past here, playing seven or eight times a year highly toxic pesticides still can not work. And enhance the resistance of pests, rampant damage year after year, polluting the environment, killing natural enemies,