Tree care professionals, woodland owners, and urban natural resource managers are greatly concerned with managing oak wilt across Minnesota. Oak wilt is responsible for killing large numbers of oaks annually across the state. A recent confirmation of oak wilt in Morrison County near Little Falls makes it the most northwestern find in Minnesota. Researchers and forest health specialists from the US Forest Service, MN Department of Natural Resources, and University of Minnesota Extension recently published an updated fact sheet on oak wilt in Minnesota.
Oak wilt occurs in 24 states in the eastern United States. In Minnesota, the disease is currently found in an area bounded on the north by Pine County, on the west by Stearns and Nicollet counties, and south to the Iowa border. Oak wilt is most severe in red oak group species such as northern red oak and northern pin oak.
The fact sheet represents an assessment of the current status and trends of oak wilt across Minnesota, highlighting tree symptoms and the biology of the oak wilt fungus. Management strategies and best practices are presented for managing and mitigating the spread of oak wilt throughout the state.
Interested readers can find the updated fact sheet here. There is also a printer-friendly (PDF) version of the fact sheet. Keep up-to-date on the current risk period of the disease by visiting MyMinnesotaWoods’ oak wilt risk page.