Leaving a stub behind will make it harder for the tree.
The post oak limbs that die off should be pruned to the limb of origin and sealed with Treekote or roofing cement. Any live limbs that require pruning should be approached with the same guidelines. Black jack oak trees are a dryer tree than the post oak. Pruning cement has a tendency to come disadhered from the application site.
In the case of a wounded oak tree, it best you use a pruning sealer immediately after pruning.
But there are exceptions to every rule.
There are several products you can use to seal the wounded areas, but keep in mind that sealer only lasts for about 10 days. This is adequate time for the oak tree to self-heal, and limit the production of sap (which certain insects are looking for).Estimated Reading Time: 7 mins.