所谓病害的流行,是指植物侵染性病害,在一个时期内或一个地区内发生普遍而且严重,他寄主植物或其产量受到很大的损失。近几年来,红松落针病是在东北地区内普遍流行的一种病害。致病菌主要为大散斑壳(Lophodermium maximum B.Z Heet Yang)。该菌既危害苗圃的红松幼苗,又危害山地红松成、幼林。是继红松孢锈病后又一种主要威胁红松的病害。由于该病先后在东北各地爆发性发生,不仅发生面积大,而且扩散蔓延快,危害严重,给林业生产带来很大的 The so-called disease epidemic, refers to plant-borne diseases, occurred in a period of time or in a general and serious area, his host plant or its production suffered a great loss. In recent years, red pine needle disease is a common disease in the northeast region. The pathogen is mainly Lophodermium maximum B.Z Heet Yang. The bacteria are not only harmful to nursery Korean pine seedlings, but also endanger the korean pine, young forest. It is another major threat to Korean pine after the rust of coniferous pine. Due to the disease has occurred in all parts of Northeast China, not only occurred in large area, but also spread rapidly spread, endangering serious, to forestry production has brought great