落叶松枯梢病,1960年后在北海道和东北两地发生最严重,面对当时的情况,采取对病原菌进行基础研究和药物防治相结合,通过林业措施以减轻病害等各项政策,使本病逐渐有所减轻。另外,鉴于落叶松属内品种不同,或者既使在同一林分内,由于个体不同,该病的发生情况也不同,所以想以培育抗病品种为目的,而选拔本病的抗性个体和进行繁殖。笔者从东北各地的重病林分中,选拔了抗病予选树,并进行了繁殖。得到东北林木育种场的协助,在本病发源地设立了鉴定林,做了一次测定。然后,从其中选出一些耐病性不 Larix cucumbers are the most serious disease in Hokkaido and northeastern China since 1960. In the face of the prevailing conditions, basic policies and drug control measures for pathogens are combined to reduce disease through forestry measures and other policies. The disease gradually eased. In addition, in view of the different larch species, or even in the same stand, due to individual differences in the occurrence of the disease is also different, so want to cultivate resistant varieties for the purpose of selecting the disease resistant individuals and Breeding. The author from all over the northeast of the severely affected forest, selected disease-resistant selection tree, and carried out breeding. Be assisted by the northeast tree breeding farm, set up a certified forest in the birthplace of this disease, made a determination. Then, pick some of the disease-resistant ones out of them