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一、病症 苹果根腐病主要为害根颈及根部。发病初期,病树生长衰弱,叶形变小,叶色褪绿。病情进一步发展,则枝干失水皱缩,枝梢的先端及细小枝条开始枯死,最后全株死亡。观察根颈及根部,则发现皮层溃烂,皮层与木质部之间充满白色至淡黄色的扇状菌层,病组织有浓厚的蘑菇味。
First, the disease Apple root rot is mainly harmful to the root neck and root. Early onset, sick trees grow weak, smaller leaves, leaf color chlorotic. The further development of the disease, the branch shrinkage loss of water, the tip of branches and small branches began to die, and finally the whole plant died. Observation of the root neck and root, then found that cortical ulceration, cortex and xylem filled between white to light yellow fan-shaped layer of bacteria, the disease has a strong mushroom flavor.