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山东青岛等地生长的杜仲(Eucommia ulmoides Oliv.),在适当时期剥皮后,完全暴露,一般仍能再生出新皮。但是在湖北省的潜江县和巴东县,适于杜仲剥皮的时期恰在高温干燥的夏季,因此,剥皮后需要立即包裹塑料薄膜才能再生新皮。但是,这样处理再生新皮时,却非常容易感染一种细菌病,使再生的新皮发生不同程度的坏死,严重的甚至于也可使未成熟木质部大面积坏死(图版Ⅰ,1),或整个树皮腐烂,导致植株死亡。因此,为了探索有效的防治措施,有必要先了解这种病菌的侵染方式和树干组织的变化,以便得到较好的防治效果。
Eucommia ulmoides Oliv., Grown in Qingdao, Shandong, and other places, is completely exposed after being peeled in proper time and generally regenerates a new skin. However, in Qianjiang County and Badong County, Hubei Province, the period suitable for euchroma stripping is just in the high-temperature and dry summer. Therefore, immediately after peeling, the plastic film needs to be wrapped to regenerate the new skin. However, the treatment of regenerated new skin is very susceptible to a bacterial disease that causes varying degrees of necrosis of the regenerated new skin, even severe necrosis of the immature xylem (plate I, I), or The entire bark decay, leading to plant death. Therefore, in order to explore effective control measures, it is necessary to understand the pathogen infection and trunk tissue changes in order to get better control effect.