How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Dutch elm disease

Do not confuse Dutch elm disease symptoms with the leaf discoloring caused by the elm leaf beetle. Elm leaf beetle chews holes and skeletonizes leaves, which may then become discolored, often giving the tree a brown appearance when viewed from some distance. The elm bark beetle carries Dutch elm disease; the elm leaf beetle does not.

Elm bark beetle feeding in crotch of twig
Elm bark beetle in crotch of twig
Elm leaf beetle damage to leavesElm leaf beetle damage to leaves
Bark beetle larval galleries
Bark beetle larval galleries

 

 

 


Statewide IPM Program, Agriculture and Natural Resources, University of California
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