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