我们许屯公社有苹果树40余万棵,卷叶虫和红蜘蛛是我们地区果树上的两大害虫。多年来,由于单靠化学防治,害虫产生了抗药性,防治效果显著降低。在农业学大寨运动中,我们认真贯彻“预防为主,综合防治”的植保方针,从1975年开始用赤眼蜂防治苹果卷叶虫,效果很好。 We Xu Tuen commune has more than 40 million apple trees, leaf roller worms and spider mites are the two pests on our region fruit trees. Over the years, due to chemical control alone, pests have become resistant and the control effect is significantly reduced. In the Dazhai Agricultural Science Movement, we conscientiously implemented the plant protection principle of “prevention first and comprehensive prevention and control”. From 1975 Trichogramma was used to control apple leaf roller and the effect was very good.