目标管理分类施策──我省综合防治天牛取得成效李秀山我省认真贯彻“预防为主，综合治理”的方针，全面实施“谁经营、谁防治”的原则，经过广大干部群众的努力，取得了一定成效。据统计，全省杨树天牛发生面积由９１年的８１．６５万亩下降到６３．７３万亩。有虫株率由... Targeted Management Classification Policy ─ ─ comprehensive prevention and control of our province made ?? success Li Xiushan province earnestly implement the “prevention first, comprehensive management” approach, the full implementation of “who operate, who control” principle, through the efforts of the cadres and the masses, Achieved some success. According to statistics, the area of ​​the province’s poplar days declined from 816,500 mu in 1991 to 637,300 mu. Insect strain rate by ...