Holes in oak tree
I have an oak tree (either black or red oak) in my yard that has two holes in it where branches had been cut, approximately 6-8" deep, 6' above its base. The tree's trunk is about 20" in diameter and it is probably 60' tall in what was a thick forest. Is there some treatment I can perform to extend the life of the tree? I know people used to fill these holes with cement to keep the wood from rotting.
Baltimore County Maryland
No pruning paint, sealer, concrete or foam is recommended as it can interfere with the healing process. Keep the tree watered during dry periods and make sure mulch is no thicker than several inches and keep away from the base of the trunk.
If you have additional symptoms, you may want to contact a certified arborist for an onsite diagnosis regarding the health of the tree, make sure it is not a hazard, and the best way to proceed.