半个多世纪以来,用化学农药防治病虫害对农作物增产增收作出了很大贡献。但长期依赖和大量使用化学农药所带来的环境及农产品污染、生态失衡以及食品安全等问题也日益显现。化学农药在使用过程中产生的“三R”问题,即残留(Residue)、抗性(Resistance)及害虫再猖獗(Resurgence)也越来越严重。不合理使用化学农药防治害虫也是引起城市生态环境恶化的重要根源之一。 For more than half a century, using chemical pesticides to control pests and diseases has greatly contributed to the increase of crops. However, the problems of environmental and agricultural pollution, ecological imbalance and food safety caused by long-term dependence and extensive use of chemical pesticides have also become increasingly apparent. Chemical pesticides in the use of the “three R ” problems that Residue, Resistance and pest resurgence is also more serious. Unreasonable use of chemical pesticides to control pests is also one of the important causes of the deterioration of urban ecological environment.