我场有果树16万株,一年喷药5次左右,已有14年用药历史。由于长期使用广谱剧毒有机磷杀虫剂,杀伤大量天敌,破坏了生物群落的生态平衡,使红蜘蛛和某些害虫产生抗药性,失去天敌控制。因而,虽然喷药次数逐渐增多,浓度不断提高,但防治效果很不理想。因此,1974年我场进行了苹果主要害虫的综合防治试验。 My field has 160,000 fruit trees, about 5 times a year spraying, has 14 years of medication history. Due to long-term use of broad-spectrum virulent organophosphate pesticides, killing a large number of natural enemies, undermining the ecological balance of biological communities, red spider and some pest resistance, loss of natural enemy control. Thus, although the number of spraying gradually increased, the concentration increased, but the control effect is not ideal. Therefore, in 1974 I conducted a comprehensive apple pest control trials.