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松毛虫是我场油松林的一大害虫。林本由于松毛虫的为害,损失是惊人的。就当前状况看,随着林地面积的增加,松毛虫的发生面积也在扩大。由于基层单位资金不足,只能对松毛虫大发生的林地进行重点防治,处于“头痛医头、脚痛医脚”的被动局面。根据几年的防治实践,笔者认为,在防治害虫大发生林地的同时,对松毛虫未成灾的林地应进行及早防治,控制虫口数量和蔓延速度,以减少林木损失。从防治成本、生态效益考虑,控制低虫口要比等到害虫大发生时防治好得多。马鞍山林场松岭营林区1981年近1000亩林地发现松毛虫,经调查,林缘虫口密度为2
Pine caterpillars are a major pest in my pine forest. Lin Ben due to the damage caused by pine caterpillars, the loss is staggering. Judging from the current situation, with the increase of forest area, the occurrence area of Dendrolimus is also expanding. Due to lack of funds at the grassroots level, only the large-scale occurrence of dendrolimus can be prevented and controlled, and the situation is “passive.” According to several years of prevention and control practices, I believe that in the prevention and control of pests occurred in large areas of woodland at the same time, the unmanaged caterpillar pine forest should be controlled as soon as possible to control the population and spread of insect population in order to reduce the loss of trees. From the prevention and control costs, ecological considerations, the control of low insect population than the wait until the prevention and treatment of pests is much better. Ma On Shan Forest Ridge Pine Ridge forest area in 1981 nearly 1,000 acres of woodland found pine caterpillars, after investigation, the density of forest edge insect population 2