现代农业和环境保护对新农药品种的性能要求日益苛刻 ,导致农药开发的成功率愈来愈低。 5 0年代能从两千个化合物中筛选一个上市品种 ,到了 70年代末 80年代初 ,开发一个新品种约需随机合成筛选一万个化合物 ,还需要通过详细的毒性和环境评价。相应地 ,新农药开发费用日益提高 Modern agriculture and environmental protection are increasingly demanding on the performance of new pesticide varieties, leading to a lower success rate of pesticide development. In the 1950s, one of two thousand compounds was screened for a listed product. By the late 1970s and early 1980s, the development of a new variety required about 10,000 compounds to be randomly synthesized and subjected to detailed toxicity and environmental assessments. Accordingly, the cost of developing new pesticides is increasing day by day