tree disease 由细菌、真菌、病毒、藻类、不适宜的气候或土壤等因素引起的树木体发育不良、枯萎或死亡。
对园林树木病害进行了系统调查，查清我市园林树木病害94种，为园林树木病害防治提供科学依据。
We investigated garden tree disease in Qiqihar city, and found that there were 94 diseases altogether, This provides scientific basis for tree disease control.
树木溃疡病是一类危害严重的枝干病害，病原种类多，寄主范围广，症状复杂。
Tree canker is a kind of most serious tree trunk disease which have a various of pathogens, a wide distribution of host and complex symptoms.
此外，林地内的土壤元素含量在病害侵入前后也会发生一定的变化：受到轻度砍伐的林地内其P、K含量较高，有利于提高树木对病虫害的抵抗能力。
Furthermore, proportion of total N, available P, available K in soil are dissimilar after the disease invaded: Capacities of resistance on disease will be enhanced if infect trees are cut appropriate.
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