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CUES: Center for Urban Ecology and Sustainability

Diagnosis Case: Elm

Elm Leaf Beetles feed on leaves, which causes the shot holes in elm leaves. This is not true of the Native Elm Bark Beetle or the European Elm Bark Beetle. European Elm Bark Beetles feed briefly in the bark of small healthy branches, then move to dying or dead elm branches. Native Elm Beetles feed in twig crotches on healthy elms. They also move to weak or dead elms after feeding on healthy tissue. This is an important factor because Ceratocystis ulmi, the fungus that causes Dutch Elm Disease, is introduced by beetles that alternate between healthy to dead tissue.


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Last modified on March 06, 2013