论文部分内容阅读
我分场现有落叶松人工林10万余亩,1973年以来,有大面积人工林遭受落叶松尺蠖的严重危害,虫口密度,每亩达30万条以上。翠绿的松林针叶被吃尽,状如火烧,被害林分的年生长量,只有正常林分的1/3。面对这一新的课题,我场广大工人、干部和技术人员,坚持调查研究,建立了虫情观测点,不断探索害虫生活史和发生发展规律,开展群众性的防治试验,三年来基本上控制了虫情发展,有效地降低了虫口密度,保护了森林资源。
I now have more than 100,000 acres of larch plantations in our sub-division. Since 1973, a large area of plantations has suffered serious damage from Larix kaempferi. Insect population density has reached more than 300,000 per mu. Green pine needles are eaten, like burning, the annual growth of the damaged forest, only normal forest stand 1/3. In the face of this new issue, the vast majority of workers, cadres and technical personnel in our field have insisted on investigations and studies, set up observation points for insects, continuously explored pest life history and the law of development and development, and carried out mass prevention and control trials. Over the past three years, basically, Control of the development of insects, effectively reducing the population density, protect the forest resources.