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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.

Dec 14, However, if you are going to prune oak trees, it’s important to do it in winter to prevent introduction of oak wilt” says Paul Cigan, a WDNR forest health specialist. The best period to prune oaks is between the months of October and March.

In spring, stop pruning when daytime temperatures reach 50 degrees. This is because oak wilt - a fatal disease of Estimated 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 using reloadable Chemjet Tree Injectors. Mar 30, Pruning and cutting oaks in spring and early summer leaves them vulnerable to oak wilt, which rapidly kills trees in the red oak group and weakens those in the white oak group.

Any damage during this time, including broken branches caused by storms, provides an opportunity for the oak wilt fungus to attack the tree by exposing living tree tissue beneath the.

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.