松落针病是世界性常见病害,分布较广,主要危害二针松和五针松树种,也危害其他松属和云杉等树种。它会影响病树正常生长,引起病树提早落叶,甚至会导致病树死亡。该病在黄土高原人工油松林中发生普遍,发病率位居油松病害之首,已 Pine needle disease is a common disease worldwide, is widely distributed, the main hazards Pinus and Pinus pine needles, but also endanger the other Pinus and spruce trees. It will affect the normal growth of diseased trees, early diseased trees cause decay, and even cause the death of diseased trees. The disease occurred in the artificial pine forests in the Loess Plateau, the incidence rate of the first pine disease has been