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Nature
Home›Nature›DNR: Prune oak trees in winter to help prevent oak wilt

DNR: Prune oak trees in winter to help prevent oak wilt

By Jalen Maki
December 20, 2022
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Courtesy of the Wisconsin Department of Natural Resources

WISCONSIN – The Wisconsin Department of Natural Resources (DNR) is reminding the public to prune oak trees this winter, as there’s high risk of pests spreading tree diseases, such as oak wilt, during the spring months.

Oak wilt is Wisconsin’s most destructive oak disease, killing thousands of healthy trees annually. It’s common in the lower two-thirds of the state and spreads farther north each year.

It is ideal to prune trees in the winter, since branch damage or weak branch structure is more visible, and pests that cause harmful tree diseases are inactive in cold temperatures.

Oak wilt is one such disease that spreads through tiny sap-feeding beetles attracted to open wounds on trees.

“What’s encouraging about oak wilt is that preventing and slowing its spread takes only the most basic measures,” said Paul Cigan, DNR Forest Health Specialist.

Cigan said Wisconsin residents should only prune trees in winter. Pruning oaks during April through July places them at the greatest risk for oak wilt infection and should be avoided when possible.

Cigan also suggested keeping firewood transport local and consulting a certified professional if you suspect oak wilt by finding oaks with sudden, mid-to-late summer leaf drop.   

Prune young trees to establish a central trunk, proper trunk taper and good branch structure and spacing. Prune older trees to remove dead or hazardous limbs. In addition, it’s recommended to prune landscape trees throughout their lifetime to maintain strong structure and remove dead wood.

Follow the DNR’s Oak Harvesting Guidelines (www.bit.ly/3VdW6mR) to reduce risk of oak wilt while oak harvesting in a forest setting.

Learn more about oak wilt on the DNR website at www.dnr.wisconsin.gov/topic/foresthealth/oakwilt.

DNR recommends pruning oak trees during winter, when oak wilt disease-carrying insects are inactive.
TagsDNROak Treesoak wiltWisconsin Department of Natural Resources
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