由于长期在同一地区同一果园内使用单一的农药防治某种病虫害,经过一定时间后,药效就会明显下降,甚至无效。在果树生产过程中,为了保持药剂的效力,一方面是增加药剂的 Due to long-term use of a single pesticide in the same area in the same orchard to control certain pests, after a certain period of time, the efficacy will be significantly reduced, or even invalid. In the fruit tree production process, in order to maintain the effectiveness of the drug, on the one hand, to increase the agent