松毛虫是我省林木生产上的重要害虫,一九七二年为害面积约在四百万亩左右。被害松林,轻者生长衰弱,重则成片枯死。过去采取人工、药物防治,虽取得很大成绩,但也存在一定问题,况且连年使用化学农药,势必污染环境,害虫产生抗药性,同时大量杀伤多种天敌,助长虫害大发生。 Dendrolimus is an important pest in tree production in our province. In 1972, the damage area was about 4 million mu. Damage pine forests, the light weak growth, while the weight is dead. In the past to take artificial, drug prevention and control, although achieved great success, but there are also some problems, Moreover, the use of chemical pesticides in successive years, it is bound to pollute the environment, pest resistance, killing a large number of natural enemies at the same time, help pests.