松毛虫是危害我省松林的大敌,1972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。过去多采用人工防治、药物防治或飞机喷药,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,削弱了松林的抗虫性能,反而会助长虫害的大发生。 Dendrolimus is the enemy of the pine forests in our province, in 1972 the damage area of ​​about four million mu. Damage pine forests, the light weak growth, while the weight is dead. In the past, the use of artificial prevention and control, drug control or aircraft spraying, although achieved great results, but there are some problems, Moreover, the use of chemical pesticides year after year, it is bound to pollute the environment, pests produce resistance, killing a large number of natural enemies at the same time, weakened pine Insect resistance, but will contribute to the occurrence of pests.