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承德市金厂沟林场位于本市西郊,林区与双塔山风景区毗连,历年遭松毛虫害严重。场方虽竭尽全力进行了除治,但虫害发生面积年年有增无减、虫口密度也逐年扩大。查其原因;为该林区与权属不同的山林交错分布(插花山)所致;其权属有国营、有集体;其管理体制还有多户个体承包。由于除虫不能齐心协力,使防治工作事倍功半。1988年市森防站金厂沟林场观测点发布的虫情动态揭示;国有林区及其周围集体所有林将有万亩松林遭受严重松毛虫害;其平均虫口密度为24.6,受害株率100％,单株
Chengde Jinchanggou Forest Farm is located in the western suburbs of this Municipality, adjacent to the Twin Towers Scenic Area and the forest area. Although the field made every effort to rule in addition, but the area of pests increased year after year, insect population density also expanded year by year. Check the reason; for the forest area and ownership of different staggered distribution of mountain forests (Huashan) caused by its state-owned, collective; its management system and multi-family contract. As insecticide can not work together to make prevention and treatment work less effective. In 1988, the forest insect monitoring station released at the Jinchanggou Forest Farm in Morinagatara Forest Station revealed the situation that there would be severe pine caterpillars in all the forests in and around the state-owned forest area; the average population density was 24.6 and the damage rate was 100 %, Single plant