根朽病分布于全国各地,在老果园中发生严重,造成树木成片死亡。根朽病为害多种果树,如苹果、梨、杏、山楂等。它是一种弱寄生菌,一般幼树很少发病,成年树特别是老龄树容易受害。根朽病主要造成主侧根和根颈处腐烂。发病初期,表皮上出现暗褐色水溃状病斑,软而肿胀。逐渐扩大后流出褐色粘液,有浓厚的蘑菇味。若将根皮掀起,即可见到一层白色的菌丝层,呈扇状分 Root disease spread throughout the country, in the old orchard serious, causing the trees into pieces died. Root disease damage a variety of fruit trees, such as apples, pears, apricots, hawthorn and so on. It is a weak parasitic bacteria, the general incidence of young trees rarely, adult trees, especially elderly trees vulnerable. Root rot caused mainly the main root and root neck decay. Early onset, the skin appears dark brown water-like lesions, soft and swollen. After gradual expansion out of brown mucus, a strong mushroom flavor. If the root bark off, you can see a layer of white mycelium, was fan-shaped points