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Ivory-marked Beetle

July 21, 1999

Ivory-marked beetles are being found in various areas of the state, particularly in Will County. This insect is 1/2 to 1 inch long. It is brown with two pairs of whitish oval marks at the front of the wing covers and two additional pairs near the middle of the wing covers. As a longhorned beetle, its antennae are at least half as long as the body.

This native insect feeds on the dry heartwood of many trees including oak, hickory, ash, maple, honey locust, elm, chestnut, and baldcypress. It does not attack living tissue but will heavily attack the heartwood of living trees if there is a frost crack or other wound that allows it access. This insect also attacks dead and dying trees. Its life cycle normally lasts for two years, although beetles have emerged from furniture and flooring after 25 years. Control is usually not recommended.

Author: Nancy Kahida Phil Nixon


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