近些年,由于农药长期使用,许多病虫对老农药产生抗药性,农民遇到防效不理想,片面认为都是老农药药效不好的原因造成的,所以他们选用农药往往求新,而且误认为农药越新、价格越高越有效。商家利用这点,不断推出利润高的新名农药(仅仅是商品名称不同,其实仍是老农药),农民往往被农 In recent years, due to the long-term use of pesticides, many pests and diseases have become resistant to old pesticides. Peasants encounter unsatisfactory prevention and control effects, which are all thought to be caused by poor efficacy of old pesticides. Therefore, And mistakenly believe that the newer pesticides, the higher the price the more effective. Businesses take advantage of this, continue to introduce new high-yield pesticides (only the name of the different products, in fact, still old pesticides), farmers are often farmers