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. 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, 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 oaks - is spread by beetles that feed on the sap of tree wounds.
But these beetles are not active in Estimated Reading Time: 3 mins. 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. Feb 02, Choose one of the responses below: April 1 to July 15 (spring-mid summer, SPS) - south of tension zone.
April 15 to July 15 (spring-mid summer, SPS) - north of tension zone. July 16 to Sept. 30 (mid summer - early fall, SEF) statewide.
Oct. 1 to March 31 (fall-winter, FWN) if south of tension zone. Apr 30, Oak trees pruned during the growing season are at greater risk of infection.
According to experts at Michigan State University Extension, the normal time-tested advice to prevent oak wilt is to not prune oaks after April 1, otherwise you risk injuring oaks. While risk of infection decreases after mid-July, it’s prudent to avoid pruning any type of injury of these majestic trees until November. Left, Red oak.