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I would not trim it now as it might stress it even more. Paint the bare branches and the trunc (virtually the whole tree) with a white latex paint mix (50% water / 50% white paint) to avoid sun burn which will kill the exposed tissue and everntually the plant.Don't over water it, let it come back completely then you'll know where to make your cuts...If it turns out the only branch still alive is the one that has already sprouted, you'll have to train it to become your new leader. If you should leave it that way your tree would have a very unbalanced structure and that would be good!
If you have a heavy clay soil (which I doubt if you do) and you amended the soil, you will lost the tree to root rot. NEVER amend clay soil.
No need to paint the "trunk"/branches with paint. What type of potting mix did you use? Are there drain holes in the bottom of the pot? Also make sure the pot is not sitting on a tray.
OK. I see where his Hass is in the ground. Based on the looks of the top, something is wrong with the bottom. Also, if you move a tree from a protected area to full sun it will induce stress....leaf drop.Avocados don't like a lot of salts so the fertilizer could have been the culprit. I learned that the hard way.
I am scared to report it right now. I wanted to put it in the ground, but I need to wait for it to recover first.