红松烂皮病是一种普遍危害红松的病害,在东北三省人工红松林内普遍发生,严重地区的发病率达80％以上,个别严重者整株死亡,给林业生产造成一定的损失。对此,如能预测病害的发生及发展规律,制定相应的防治计划和措施,将会大大地减轻病害的发生及对林木的危害。由于红松烂皮病的发生与发展,不但受到自身内因的作用,而且也受到许多外界因子的综合影响,如坡向、坡位、林分密度等。这些因子对病害的发生起着重要作用,但这些因子有的却不能直接用数量来表示。通过数量 The disease of koraiensis is a common disease of Korean pine. It is common in artificial Korean pine forests in three provinces of northeast China. The incidence of severe pine is more than 80%. Some of the serious ones die whole plant and cause some losses to forestry production. In this regard, if we can predict the occurrence and development of diseases and formulate appropriate prevention and control plans and measures, we will greatly reduce the occurrence of diseases and the damage to trees. Due to the occurrence and development of koraiensis, not only by its own internal causes, but also by a combination of many external factors, such as the slope, slope position, stand density and so on. These factors play an important role in the occurrence of diseases, but some of these factors can not be directly expressed by the number. Through the number