落叶松发生枯梢病的面积,在日本北海道约为5万公顷,在东北部达1万多公顷,总共约占落叶松造林总面积的10%,估计受害面积今后还可能扩大。因为该病的诊断困难,病情严重,传播迅速,一旦发病又较难防治,所以它就成为影响落叶松造林成活的重要因素之一。 Larch blossoms occur in an area of ​​about 50,000 hectares in Hokkaido, Japan, more than 10,000 hectares in the northeast, a total of about 10% of the total area of ​​larch plantation, it is estimated that the affected area may expand in the future. Because of the diagnosis of the disease difficult, serious condition, rapid transmission, once the disease is more difficult to control, so it has become one of the important factors affecting the survival of Larix.