Robert

I have a number of elms, of various types.....and I've had the same thing happen to some of mine; they just go bare for reasons not apparent to me, but don't give up hope, in my case I just let them sit a while, watered them regularly, and in all cases new leaves re-appeared in time....and the tree continued leafing 'til it became full and beautiful again. I have no idea what causes this, and I think I could well have discarded that tree (when it was bare), but I'm glad I didn't.
I wish I could give you a more knowledgeable answer, but at least I can give you some hope.........try it.

Robert......in Santa Cruz

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Robert.........in Sta.Cruz