Joseph O'Brien, USDA Forest Service, Bugwood.org
Dutch Elm Disease
Ophiostoma ulmi

Dutch Elm Disease (Ophiostoma ulmi ) is a fungal pathogen of Elms especially the American Elm . It is a native of the Orient and was first detected in Ohio in 1930.

Streaking below the bark and flagging, or wilting and yellowing of the leaves on a branch of the tree, are common symptoms of the disease which has decimated over half of the American Elms in this country.

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