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Diagnosis Case: Elm
| Since the Elm Leaf Beetle feeds on the undersurface of leaves and pupates at the base of elm
trees, you will not see galleries (tunnels) with Elm Leaf Beetles. However, both the larvae of the Native Elm Beetle and
the European Elm Leaf Beetle live within the galleries in weak or dead elms. *** To help identify which beetle may be doing damage to the elm, look closely at the galleries formed in the bark.
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Gallery from European Elm Bark Beetle The European Elm Bark Beetle leaves behind galleries that go parallel to the grain of the tree. Photo: John A. Williams, USDA Forest Service, www.insectimages.org
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Gallery from Native Elm Bark Beetle The Native Elm Bark Beetle leaves behind galleries that go perpendicular to the grain of the tree. Photo: John A. Williams, USDA Forest Service, www.insectimages.org |
Back to Elm Diagnosis
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