辽宁省油松枯萎病的发生及原因分析

Distribution and loss estimation of Pinus tabulaeformis blight in Liaoning Province

油松枯萎病主要分布在辽宁省的本溪、丹东、抚顺、辽阳、鞍山、营口、大连、铁岭和沈阳 9个地区内 ,在 2 4 92万hm2 的油松林分中 ,有 7 4 9万hm2 发生了枯萎病 ,占这些地区油松林总面积的30 1% ,平均发病指数为 16。重度发病区集中在本溪、抚顺和辽阳地区 ,发病率均超过 4 0 %以上。油松枯萎病的发生与树种组成、林分密度和郁闭度的关系密切。油松枯萎病对林木造成的损失是严重的 ,解析木的解析估算 ,10a间全省损失人民币 11

Pinus tabulaeformis blight was prevailing in Benxi,Dandong,Fushun,Liaoyang,Anshan,Yingkou,Dalian,Tieling and Shenyang in Liaoning Province.Among 24 92×10 4 hm 2 of Pinus tabulaeformis stands,7.49×10 4 hm 2 were infested,which was 31 02%,the average disease index was 16.The incidence was over 40% in Pinus tabulaeformis stand in Benxi,Fushun and Liaoyang.The disease was correlated with tree species composition,stand density and canopy density.The economic loss reached 11.3×10 8$ in Liaoning Province by analytic tree estimating.