为了与病虫害作斗争,几百年前已开始使用农药。施用农药在发展农业生产上取得了明显效果。但是,在长期使用农药的过程中,也出现了抗药性以及对人、畜和其他有益生物危害等不少问题。有的地区因长期使用农药,造成水源严重污染,鱼虾大量死亡。为此,当前国外农药发展的总趋势是发展高效低毒性农药,逐步推广生物性农药,研究探索新特异性制剂和采用综合防治措施。 Pesticides have been used for hundreds of years to combat pests and diseases. The application of pesticides in the development of agricultural production has achieved remarkable results. However, in the long-term use of pesticides, many problems such as drug resistance and harm to humans, livestock and other beneficial organisms have emerged. In some areas, due to the long-term use of pesticides, causing serious water pollution, fish and shrimp died in large numbers. Therefore, the current trend of the development of foreign pesticides is to develop high-efficiency and low-toxicity pesticides, to gradually promote biological pesticides, to explore new specific agents and to adopt comprehensive prevention and control measures.