Emerald Ash Borer Spreads Through The North

By Paul Cigan, DNR Forest Health Specialist, Hayward;
https://dnr.wisconsin.gov/topic/foresthealth/staff, 715-416-4920

This winter, the spread and impact of emerald ash borer (EAB) have been confirmed in several new northern townships in previously invaded counties.

These include Marengo (Ashland County); Gordon, Hawthorne and Oakland (Douglas County); Cadott and Colburn (Chippewa County) and Balsam Lake and St. Croix Falls (in Polk County).

Photo showing emerald ash borer larvae carving S-shaped channels in ash trees.

Emerald ash borer larvae carve S-shaped channels in ash trees. / Photo Credit: Paul Cigan, Wisconsin DNR

The presence of woodpecker damage (i.e., flecking) on stems and branches of ash trees is a reliable symptom of EAB infestation. The Wisconsin Department of Natural Resources encourages residents to inform their area’s DNR forest health specialist if they find woodpecker flecking in any community (town, village, or city) that does not have a confirmed detection, as indicated by this map.

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