过量使用农药害虫会变得难于消灭对于容易防治的害虫一旦过量使用农药，则会造成不易防治的害虫数量的增加。那么，究竟有没有不使难于防治害虫增加的办法呢？本文以梨和柿为例，就此问题进行深入的讨论。１难防害虫增加的原因首先，以害虫防治的难易程度作为标准，对大田... Excessive Use of Pesticides Pests can become difficult to eliminate. Excessive use of pesticides for easily controlled pests can result in an increase in the number of pests that are difficult to control. So, is there any way not to make it difficult to control pests? In this paper, pears and persimmons, for example, in-depth discussion of this issue. 1 reasons for the increase of pest prevention First of all, taking the ease of pest control as a standard, on the field ...