Warning Avoid pruning oak trees during the active growing months of April through June.

Nov 28, Avoid pruning oak trees during the active growing months of April through June. The chance for developing oak wilt from the open pruning wound is a high risk.

Prune. Nov 26, Oak trees 3 years or older can be trimmed to a certain shape, but you must only remove branches that are growing towards the center of the tree. You should also be aware of any branches that rub against each other, as rubbing can create wounds on the tree that expose it to treeclear.barted Reading Time: 2 mins.

Oak tree pruning should be done at least once a year to help the tree shape. The central leader trunk should always be the tallest, largest branch.

Branches that cross other branches are good candidates for removal, as are inward growing branches and branches that can no longer get any treeclear.barted Reading Time: 8 mins. Mar 15, Proper pruning of large tree limbs involves three cuts: Cut #1, Notch Cut: Cut a small notch in the bottom of the limb, feet away from the trunk, and about a quarter of the way through. This notch will keep the bark from splitting when you make the next cut.

Jan 14, All cut surfaces larger than a broomstick (or your thumb) should be coated with pruning paint (or paint of some type) to prevent direct access to the fresh wood by the tiny beetle that carries the fungus. There is a fungicide that can be injected into healthy trees that are within oak wilt treeclear.barted Reading Time: 7 mins.