普遍认为害虫种群的经济阈值(ET)就是应该据以进行防治的水准。对它的认识关系到合理使用农药与害虫综合治理的成功与否。昆虫学家与经济学家对可以影响它的各种因素进行了研究。一般来说,应该据以进行防治的害虫种群水平是:害虫在该水平上造成的损失等于防治所花费的成本。但是,防治过程并不 It is generally accepted that the economic threshold (ET) of the pest population is the level at which it should be controlled. Its understanding of the rational use of pesticides and pests integrated management of the success or failure. Entomologists and economists have studied various factors that can affect it. In general, the level of pest populations that should be controlled is such that the level of pest damage caused is equal to the cost of control. However, the control process is not