In summer pruning this tree, I have two objectives--to redefine a central leader and to promote new branch formation in the central portion of the tree.
2-foot rule comes into play. I pruned off all lateral branches within the top two feet of the central leader then tip pruned the laterals below that.
If you look at the lower portion of the stem pictured at left, you can see that there are several buds trying to break that can eventually form branches to fill this naked portion of the trunk. Pruning the top of this tree will actually stimulate these bud to grow out and I'll end up with a more balanced tree.
I didn't cut off all the growth below the graft because a sudden exposure to full sun can cause sunscald on the lower trunk. Once the graft fills out with new branches and those branches start providing some shade to the trunk, I will start removing all branches below the graft union.
Three of four weeks from now, I'll need to return to this tree for additional summer pruning. I've never met a young pecan tree that didn't need additional directive pruning all through the summer. I'm sure to find some stalked buds ton remove.