Dutch Elm Disease – Ophiostoma ulmi

Dutch elm disease can be caused by two species of fungi. The fungus is transmitted chiefly by two elm bark beetles - Hylurogopinus rufipes (Eichh.), a native species, and Scolytus multistriatus (Marsh.), a species indigenous to Europe but widely distributed in North America.

All species of native North American elm are susceptible and the disease now occurs in most of the natural range of Ulmus americana from Manitoba to the Maritimes.

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