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Dec 14, Wintertime is a good time for tree pruning, when temperatures are cold, according to Wisconsin Department of Natural Resources tree health experts. An oak tree dying from oak wilt (middle) and an oak killed by the disease (right). Photo: WDNR Prune trees in winterEstimated Reading Time: 3 mins.

If you have oak wilt killing trees on your property or in your neighborhood, you do not have to sit by and watch your precious old oak trees die. You can easily treat against infection and death of trees by oak wilt using DIY trunk injection of the fungicide Propiconazole Aug 13, Late fall/winter pruning is especially important for oak trees to help prevent spread of the fungus that causes oak wilt (see University of Wisconsin Garden Facts XHT).

Late spring and summer are usually not good times of year to prune because disease pathogens are present and wound closure is slower. Mar 30, In general, the best time to prune is in winter when trees are dormant. To date, oak wilt has been found in all Wisconsin counties except Ashland, Iron, Taylor, Door, Kewaunee, Calumet and Manitowoc counties.

Several of these counties contain the highest abundance of healthy and productive oak forests in the state. Apr 03, To protect oak trees and help prevent oak wilt, the Wisconsin Department of Natural Resources advises people to avoid pruning oaks on their property from April through July. Spring and early summer pruning makes oak trees vulnerable to oak wilt, a fatal fungal disease that rapidly kills trees in the red oak group and weakens those in the white oak group.