中国虽然早在 1 0 0 0ａ以前就已有应用硫磺、铜绿、砒霜以及多种植物性农药防治病虫害的经验 ,但作为农作物病虫害防治的一项科学技术 ,农药的生产和使用技术的发展还只是新中国成立以来 ,近半个世纪内的事。据统计 ,90年代全国平均每年发生农业病虫害面积 2 .5亿ｈｍ2 次 ,防 Although China already had experiences of using sulfur, patina and arsenic as well as various botanical pesticides to control pests and diseases as early as 100a, as a science and technology for crop pest and disease control, the development of the production and use of pesticides has only been Nearly half a century since the founding of new China. According to statistics, an average of 225 million hm2 of agricultural pests and diseases occur each year in the country in the 1990s.