我国每年因农业害虫造成的损失达数百亿元。人们为了保护栽培植物的正常生长,采取各种措施防治农业害虫,取得了巨大成就。但在害虫的防治过程中,由于农药具有高效、速效、方法简便等优点,多年来主要依靠化学农药,仅我国每年生产的化学农药的原药就达40万吨左右。虽然农药对害虫 The annual loss caused by agricultural pests in our country amounts to tens of billions of yuan. In order to protect the normal growth of cultivated plants, people have made great achievements in taking various measures to prevent agricultural pests. However, due to its advantages such as high efficiency, quick response and simple method, pesticides rely mainly on chemical pesticides for many years. Only the original pesticides produced by our country produce 400,000 tons of chemical pesticides per year. Although pesticides on pests