化学林药的使用,是目前保护森林不可缺少的措施。它的现代化,要求必须注意生态平衡、经济有效和社会安全。过去由于长期大量使用化学林药防治害虫,出现不少问题,广泛引起人门的担忧。但是,从生产实践及综合防治需要来看,化学防治还是占有一定位置。因为,化学防治一般可以达到相当高的、比较稳定的防治效果,特别当害虫非常猖獗的时 The use of chemical forest medicine is an indispensable measure to protect the forest at present. Its modernization requires that attention must be paid to ecological balance, economic efficiency and social security. In the past, due to long-term heavy use of chemical forest medicine to control pests, many problems arose, causing widespread concern. However, from the perspective of production practice and comprehensive prevention and control, chemical control still occupies a certain position. Because, in general, chemical control can reach quite high, more stable control effect, especially when the pests are rampant