I would not prune the tree back heavily like that, espcially since the wood is live, as you proved.
I tend to use the sick tree treatment as a preventative measure with any new trees that are planted that have anything but great initial results. The first year a tree is in the ground in a new location, it needs extra care. The larger/older the harder the transplant will be.
Hit it with the treatment and even if there's no leaves, foliar feed spray can be taken in by the bark to help it keep up health.
_________________ Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.
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