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Apr 30, 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 treenotch.barted Reading Time: 4 mins. Apr 07, Homeowners can reduce the risk of oak wilt infections by not pruning or otherwise injuring oaks after April While high risk of infection decreases to lower risk after mid-July, it’s prudent to simply avoid pruning oak trees from just prior to bud break to leaf drop.

This means April to treenotch.barted Reading Time: 3 mins. Aug 09, The general rule of thumb for pruning oak in Michigan is as follows:"The highest risk of infection occurs April July 15, but it is prudent to avoid pruning or injuring oak trees until they have lost leaves for the winter, typically from November through mid-March.

Aug 26, A: Indeed, the time to trim oaks is when the tree is dormant. Generally this is between late October and March, but I'd wait well into November to prune and finish up by mid-February - Estimated Reading Time: 3 mins.