I'd put Dr. Farwell's seal & heal ..or spray with latex white.

You want to clean up the wound as thoroughly as possible.......perhaps including removing the larger, upward growing branch it was attached to. And no sealer or paint - it has long been documented that this offers no benefit to the tree and can actually seal in insect and disease issues. Just a good clean pruning cut :-))

Thanks very much for your replies!

Most of what we've read on this, and from some local folk we've talked to, backs up what gardengal48 wrote - avoid the sealer/paint method.

We then figured we'd go the "cut below the break" route, but after clearing away the damage, it's looking like we may just let nature take it's course. I've attached a couple of additional photos - when the main branch broke, it took out a lower, secondary branch (the lower red arrow). Where we'd have to cut below the break is indicated by the upper red arrow. So basically, we'd be left with a stump and one branch. In the 10 years we've been here, all new growth has been generated from the existing 4 branches, 2 of which are now gone and the 3rd would be if we cut. Maybe new branches would generate if we cut off that upper branch?

Hopefully, 3 months of dry weather would help the wound to heal, and if we diligently prune that remaining upper branch, then maybe we can generate some lower growth and it will fill out - but please, by all means, feel free to shoot down that very unprofessional logic/guess,as we're open to any suggestions.

thanks again for your time and replies!

Yea sure..I knew this would come but my experience have shown better outcome with Dr. Farwells ..healing in allot better and blocking out moisture from nasty things happening down the road. Probably best to cut the whole branch off and hope for new shoots along the trunk next year, if not.. cut it to the next side branch.

When mine was a couple years old half the tree got broken out in a storm. I just let it heal on it's own and you can't tell anything ever happened to it today. Trees will heal up pretty good on their own as long as they are healthy to begin with