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Diseases of Deciduous Trees: Elm - Dutch Elm Disease

Defense compounds produced by the tree, in response to the fungus, accumulate in the outer sapwood.
These compounds cause the tree to wilt. Photo courtesy of American Phytopathological Society.

Vascular streaking (discoloration) of infected sapwood.
Photo courtesy of University of Minnesota Department of Plant Pathology.

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Last modified on March 06, 2013