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通过多年定点定株定期对１８个杨树杂交种及无性系溃疡病发病情况连续调查，研究了杨树对溃疡病的抗病性变化规律，结果表明：在本研究范围内不同抗性类型的树种对溃疡病的抗性变化规律不尽相同。抗病类型和感病类型的树种随树龄增长，其抗性并不表现出明显的变化，但抗性树种同一杂交种或无性系各单株间的病害发生是完全随机的；而感病树种各单株间的病害发生却是必然的；中抗类型的树种随树龄增大抗病性亦增大，且同一树种各单株病害的发生有着部分的随机性。各树种的形态特性与抗病性之间有着密切的相关性。西玛杨，鲁易莎杨，Ⅰ－６９杨及与美洲黑杨杂交的无性系５２号，６５号，０６号，６６号，５７号，８０号树种以其速生又有相对强的抗病性而被选用于造林的推荐树种
The results showed that the variation of disease resistance of poplar to the canker disease was studied regularly through 18 years of fixed-point and long-term fixed-point investigation of the poplar hybrids and the development of the clonal ulcer disease. The results showed that in the range of different resistant types Tree species of ulcer disease resistance changes vary. Disease resistance and susceptible tree species with age increased, the resistance does not show significant changes, but the resistance of the same hybrids or clones each disease occurs between the plants is completely random; and susceptible species The occurrence of disease is inevitable among the individual plants. The resistance of middle-resistant tree species increased with the increase of tree age, and the occurrence of single tree disease of the same species was partly random. There is a close correlation between morphological characteristics and disease resistance of each tree species. Cimicifuga, Lusha Yang, I-69 and clones 52, 65, 06, 66, 57, 80 that crossed with Populus sibirica had been shown to be fast-growing and relatively resistant to disease Nature was selected for afforestation recommended species