Dutch Elm Disease: Signs of Beetle Activity

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Beetle emergence holes, the size of the diameter of a pencil lead, and/or sawdust on the bark, indicate burrowing beetles. The beetles are 3.5 mm in size.

Actual size of beetle

European elm bark beetle

Native elm bark beetle

The characteristic pattern of the breeding galleries on the surface of the wood under the bark can also be used to identify these two beetles.

Actual wood sample of beetle galleries

Upper beetle gallery - with the grain - European
Lower beetle gallery - across the grain - Native
Upper beetle - European
Lower beetle - Native

Go to the Alberta Dutch Elm Disease Prevention page for more information about prevention efforts in the province.

For information about STOPDED or Dutch elm disease contact stopded@shaw.ca at STOPDED Hotline: 1-877-837-ELMS (3567)

Other Documents in the Series

Do You Have Elms
Firewood Can be DED-ly
Dutch Elm Disease Cycle
Signs and Symptoms of Dutch Elm Disease
Dutch Elm Disease Sampling Procedures
Dutch Elm Disease: Signs of Beetle Activity - Current Document

For more information about the content of this document, contact Shelley Barkley.
This information published to the web on June 14, 2001.
Last Reviewed/Revised on June 10, 2018.