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Extension > Garden > Diagnose a problem > What insect is this? > Insects found indoors > Beetles, bugs, ants, and other insects without obvious wings - Larger than 1/4 up to 1/2 inch long > Elm borer

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Elm borer

Elm borer

Jeff Hahn


Size: 1/2 inch long

Where/When: Most commonly found indoors during winter although can be found at other times of the year.

Significance: Is associated with American elm wood. Can be brought indoors in firewood or lumber in construction projects. Is harmless to people. Can cause cosmetic damage to wood from which it emerges, but fortunately it does not re-infest wood.

More information on Elm borers...

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