Forest Health Information
Emerald Ash Borer (EAB)
****EAB DETECTED IN BAYFIELD COUNTY****
EAB is a destructive insect pest of ash trees. Important changes to the regulation of Emerald Ash Borer in the state of Wisconsin have recently taken place. As of March 30, 2018 Wisconsin will be under a statewide quarantine for EAB. For more information about this recent development, visit the WI DNR's EAB website.
Oak wilt was discovered in Bayfield County in 2018. This is a devastating fungal disease that kills trees in the red oak group (red, black, and northern pin oaks) and also harms trees in the white oak group (white, bur, and swamp white oaks).
Below are two documents regarding oak wilt specifically in Bayfield County.