前言开发一个新的化学农药品种,不论在生产技术、药效试验、慢性毒性、残留毒性等方面都要做大量工作,需要投入大量的人力、财力、物力,这些绝非短时间内所能完成的。一般开发一个农药新品种,从研究试验到投放市场至少需十年时间,甚至更长。而农药品种的新陈代谢,一般又比其它产品更快些。故完全依靠开发新品种来解决当今农业生产上的病虫草害问题是不易实现的。因此,国外趋向于从老品种加工使用技术的研究方面寻找出路,不少国 Preface To develop a new chemical pesticide variety, a great deal of work needs to be done in terms of production technology, efficacy test, chronic toxicity, residual toxicity and so on, and requires a lot of manpower, financial resources and material resources which can not be accomplished in a short period of time of. It is generally a decade or more to develop a new crop of pesticides from research to market. The metabolism of pesticide varieties, generally faster than other products faster. Therefore, it is not easy to completely rely on the development of new varieties to solve the problems of pests, diseases and weeds in today’s agricultural production. Therefore, foreign countries tend to find a way out from the research on processing and using of old varieties. Many countries