落叶松早期落叶病分布广,危害严重,是我国北方落叶松人工林的主要病害。罹病林木树高、胸径、材积年生长量均比健康林木平均降低30%左右。为保护森林资源,我站从1973年以来进行了早期落叶病的专题研究和防治试验。几年来基本上摸清了该病病菌的流行规律和防治办法,开展了大面积的杀菌烟剂防治。经过五年 Larix early deciduous disease is widely distributed and endangered, is the main disease of Larix principis-rupprechtii plantation in China. The tree height, diameter at breast height and volume annual growth of diseased trees were all reduced by about 30% than those of healthy trees. In order to protect forest resources, I have carried out special studies and prevention and control experiments on early deciduous diseases since 1973. Over the past few years to basically find out the prevalence of the disease pathogens and prevention methods, carried out a large area of ​​bactericidal anti-tobacco control. After five years