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建国以来,我省林业建设有了很大发展,有林地面积达到251.5万亩,四旁树约16亿株,对绿化祖国,调节气候,促进农业的高产稳产已经发挥了作用。但是,随着林业的发展,林木病虫害不断发生,加上我省森林病虫防治机构不健全,除治不得方,不得力,扩散蔓延日趋严重,据统计,1970年发生病虫面积179万亩,1973年310万亩,1979年发展到587万亩,占现有林总面积的23.2％,其中:毁灭性的松毛虫181万亩,约占松林面积的30％;受害的农田林网和四旁树约8亿株。严重的林木树叶被吃光,果树花、果被蛀食,枝干害虫使枝干形成很多虫瘤。严重的影响了林木正常生长和木材质量及林产品的收益。据调查松树针叶被
Since the founding of the People’s Republic of China, forestry construction in our province has made great progress. With an area of 2.515 million mu of forest land and about 1.6 billion trees on four sides, it has played a role in greening the motherland, regulating climate and promoting high and stable agriculture. However, with the development of forestry, pests and diseases of forests continue to occur, and the forest pests and diseases prevention and control agencies in our province are not perfect. In addition to not taking effective measures, the epidemic is becoming increasingly ineffective. According to statistics, in 1970, the area of pests and insect pests reached 1.79 million mu , 310 million mu in 1973 and 5.87 million mu in 1979, accounting for 23.2% of the total existing forest area, of which 1.81 million mu are devastating pine caterpillars, accounting for about 30% of the area of pine forests; About 8000000 trees around the tree. Serious tree leaves are eaten, fruit trees, fruit is eaten, branches and pests make the stems and a large number of insects. Seriously affecting the normal growth of trees and wood quality and forest products income. According to the survey pine needles were