Severe Tree Injury From Storm

Question

I have a large, beautiful tree that suffered a severe injury two weeks ago during a storm. The tree is about 55 feet in height and had three main branches rising from the trunk at around two feet high. The branches were of equal size. One of those main branches broke completely off and left a gaping injury all the way down to the very base of the trunk. The tree is very healthy, and I believe it will recover and have a long life if I can prevent disease/pests from invading the injury. Problem is, I have no idea how to do that. Any suggestions would be greatly appreciated! I am currently renting my home and the owner wants to fell the tree, but I convinced him that I could tend to it and help it recover.

Answer 1

The following articles should be of some help to you:
https://www.gardeningknowhow.com/ornamental/trees/tgen/what-to-do-for-storm-damage-trees-repair.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm