落叶松枯梢病是落叶松的危险性病害,吉林、辽宁、黑龙江等省林区都有分布,山东省也有零星发生。目前我省已有50万亩发病,发病严重的林分,林木死亡率为5～10％。这种病害是由落叶松球座菌侵染所致,6月下旬至7月上旬开始发生,7月中旬至8月上旬为感病盛期,初病时叶部尖端失绿,而后小枝变色、变细并流脂,最后呈赤褐色,病梢顶端有一簇叶子不落。病梢弯曲或直立, Larch blight is a dangerous disease of larch, Jilin, Liaoning, Heilongjiang and other provinces have forest distribution, Shandong Province, there are sporadic. At present, our province has 50 million mu of morbidity and serious disease, forest mortality rate of 5 to 10%. This disease is caused by the infection of L. Vesiculosum from late June to early July, mid-July to early August for the peak of the disease, the beginning of leaf tip green, and then branchlet discoloration , Finer and fats, the last was auburn, tip of the tip of a cluster of leaves do not fall. Tip curved or erect,