How is Dutch Elm Disease identified?
The first evidence is a wilting in one or more of the upper branches. Leaves on these branches turn dull green to yellow and curl, then become dry, brittle, and turn brown. Positive identification of the disease can be made at the OSU Plant Diagnostic lab from a section of still living wood that is showing the symptoms. The branch should be about one half inch in diameter and be about 5 to 10 inches long. OSU Fact Sheet 7602 has a lot of information about this disease.
