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病理解剖和超微结构研究发现，溃疡病菌是在胞间隙和被分解了的细胞壁中穿行的；其对寄主组织最直接的危害是分解并利用细胞壁，破坏寄主组织细胞结构；抗病的毛白杨在被病菌侵害后，细胞内形成高电子密度的羽形结晶状沉积物，细胞壁膨胀而不疏散，而感病的北京杨和中抗的陕林４号杨在被病菌侵害后，细胞内并不形成类似毛白杨的沉积物，它们的细胞壁因侵染而变得膨胀且松散，毛白杨与北京杨、陕林４号杨在细胞壁结构上的不同，可能是毛白杨产生抗病性的原因之一。
Pathological anatomy and ultrastructure study found that the canker bacteria in the cell gap and the breakdown of the cell wall through the line; the host of the most direct harm is to break down and use the cell wall, destruction of the host cell structure; resistant Populus tomentosa After being attacked by pathogenic bacteria, the cells formed feather-shaped crystalline sediments with high electron density, and the cell wall expanded without evacuation. However, the susceptible Beijing Yang and Zhong-resistant Yang-lin 4 did not form intracellularly after being attacked by pathogenic bacteria Similar to the Populus tomentosa sediments, their cell walls become inflated and loose due to infection, Populus tomentosa and Populus, Shanyang 4 in the cell wall structure of the different may be one of the reasons Populus to produce disease resistance .