在毛主席革命路线指引下,近年来,我县利用多角体病毒防治松毛虫取得显著成效。全县松毛虫感毒致死的范围已扩大到万亩以上。1976年秋又试用飞机扩散病毒11,500亩,据调查,喷洒100倍死虫水,虫口密度减退67％。多角体病毒的发现、研究和大面积应用,为发展生物防治闯出了新路。 1973年春,东风林场的工人、技术人员和附近林区的社员群众,在东斗沟林区发现 Under the guidance of Chairman Mao’s revolutionary line, in recent years, the county has made remarkable achievements in preventing and controlling pine caterpillars with polyhedrosis virus. The county loose caterpillar insects infected with the scope of the death has been expanded to more than mu. In the autumn of 1976, another 11,500 mu of aircraft were tested for virus spread. According to the survey, 100 times of dead water were sprayed and the population density of insects decreased by 67%. Polyhedrosis virus discovery, research and large area applications, for the development of biological control has made a new way. The spring of 1973, Dongfeng Forest farm workers, technicians and members of the nearby forest masses, found in Dongdougou forest