Tennesseefig, may I ask where you are from? I'm in Boston and also experienced heavy die back, despite thorough wrapping.Trunks seem okay but lost a lot of branches, no leafing out yet. Barry, it seems to me that many People from New York to Maine have experienced hard die back. I am going to leave my trees alone now until late may. Leaving on dead wood won't harm them, but a shoot may appear higher up than you would expect if you don't prune yet.