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Asian Longhorned Beetle

July 21, 1999

A new infestation of Asian longhorned beetle, Anoplophora glabripennis, has been found in the Chicago area. This one is in Kilbourn Park, several miles west of the Ravenswood infestation. So far, only three maple trees seem to be affected. These trees were removed immediately, and surrounding areas are being searched for more infested trees.

This is the time of year that adult beetles are the most numerous, although emergence runs from spring through fall. So far this year, no adult beetles have been found in the Ravenswood quarantined area. Within the quarantined area, more infested trees have been found and removed, bringing the total number of cut trees to almost 900. Although results so far look promising, you should realize that adult beetles were found as late as mid-December last year in Chicago and that the life cycle can last as long as two years.

A related beetle, Anoplophora malasiaca, known as the rough shouldered longhorned beetle, was collected from a maple bonsai tree in southern Wisconsin. This beetle is native to Japan and occurs on sycamore and citrus trees as well as on maples.

Author: Phil Nixon Charles Helm


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