白龙江、洮河林区云杉病害调查研究

在白龙江、洮河林区，云杉病害有２１种，病原２６种，真菌性病害占主导地位。人工林发病率高且重于天然林，以叶部病害和干基腐朽类为主。近期，病害的发生呈上升趋势，上升幅度主要取决于人工林增加的幅度、经营措施。

An Investigation on Spruce Diseases Occurred in Bailongjing and Taohe Forest Regions

There existed 21 spruce diseases in Bailongjiang and Taohe regions, in which 26 pathogenic bacteria were found,and mycoses was the dominant one. The incidence of the diseases in artificial forests was higher than that in natural forests, and the diseases mainly occurred on leaves and stems. The incidence of the diseases is going up recently, and the extent depends on the increase of the area of artificial forests and related measures.