1.概念转变的需要在过去古老的农业中不使用农药,尽管有诸多的努力仍不能避免因突发性病虫害而发生饥荒。因此表面上看来,农药是使我们根除这些灾祸的救星。因为它具行:预防损失的防治作用快、使用上的机动性、简单易行的防治措施等优点;在技术上象使用化肥一样有其灵活性,施药时间也有一定的选择性。可是简便、有效、用途广泛和暂时的经济收益等优点也带 1. The Need for Conceptual Change The lack of access to pesticides in the old past agriculture, despite numerous efforts, still does not prevent starvation from sudden pests and diseases. So on the surface, pesticides are the saviores that make us eradicate these scourges. Because of its advantages: Prevention of loss of the role of prevention and control, the use of mobility, easy control measures and other advantages; the same as the use of chemical fertilizers have their flexibility, the application time is also a certain degree of selectivity. However, the advantages of simplicity, effectiveness, extensive use and temporary economic benefits are also brought