Canadian Forest Service Publications

Anatomical and physiological aspects of resistance to Dutch elm disease. 1992. Ouellette, G.B.; Rioux, D. Pages 257-307 (Vol. Chapter 13) in R.A. Blanchette and A.R. Biggs, editors. Defense mechanisms of woody plants against fungi (Springer series in wood sciences). Springer-Verlag, Berlin, Germany.

Year: 1992

Available from: Laurentian Forestry Centre

Catalog ID: 16479

Language: English

CFS Availability: PDF (request by e-mail)


Most elm species (Ulmus spp.), considered by many to be the most beautiful urban trees, are well adapted to the numerous stressful conditions in cities. Their major shortcoming, however, is their susceptibility to Dutch elm disease (DED). Although millions of elms have died since the first observation of DED about 70 years ago in Europe, they are not verging on extinction because they have a great capacity for regeneration, which explains why large elms affected by DED in woodland areas are gradually replaced by younger and smaller elm trees.

Despite the numerous studies conducted on DED, several aspects of this disease are still misunderstood. After presenting a review of elm anatomy pertaining to the ascent of sap and pathogenesis, this chapter describes our present knowledge of pathological and anatomical resistance mechanisms.

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