我们华山大队共有林地面积三千五百亩,其中赤松林两千余亩,历史上发生松毛虫害,一九六四年前,每年耗用大量的药物和人工,仍不能减轻松毛虫危害,近几年来,在毛主席革命路线指引下,坚持了“以防为主, 防治并举”的治虫方针,在以营林措施为基础,积极开展综合防治的前提下,进行了“以鸟治虫”的初步观察,保护利用灰喜鹊防治松毛虫,不仅降低了松毛虫的虫口密度,抑制了食叶害虫 We Huashan Brigade total area of ​​3,500 acres of forest land, of which more than two thousand acres of red pine forest, pine caterpillar occurred in history, before 1964, consuming a large number of drugs and labor each year, still can not reduce the damage of pine caterpillars, In recent years, under the guidance of Chairman Mao’s revolutionary line, we have adhered to the guideline of “prevention first and prevention and control simultaneously.” On the premise of implementing the comprehensive prevention and control measures based on the measures of silviculture, Preliminary observation, the protection of the use of gray magpie prevention and control of pine caterpillars, not only reduced the population density of pine caterpillars, inhibition of leaf-feeding pests