Arbor Age, September 1st, 2006
The two fungi that cause Dutch elm disease (DED) are non-native to North America. Ophiostoma ulmi first arrived on logs from Europe prior to 1930. In the 1970s, a new wave of DED swept across the United States and was eventually determined to be caused by a different, more aggressive fungus, Ophiostoma novo-ulmi. This second fungus is responsible for most of the recent resurgence in elm mortality.
What does it look like?
DED symptoms include the wilting of leaves and then the progressive yellowing and browning of leaves. Symptoms often appear on a single branch and progress downward in the...
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