Michigan peach tree cold damage
"Peach fruit are out of the shuck. Crop potential is quite variable across the region. We are continuing to see tree decline in older peach orchards in areas subjected to extreme low temperatures. Cuts made in pruning young trees with no crop reveal extensive damage to the wood in the trunk. These trees will begin to show real stress when they leaf out and hot, dry weather puts a real stress on the water conducting ability of damaged wood. Leaf yellowing and wilting will be symptoms of winter injury that will become more apparent as the season progresses."
"A cut through a scaffold limb on the six-year-old peach tree revels that wood older than two-years-old was damaged by winter cold. In severely damaged trees, all the wood is brown. Photo credit: Mark Longstroth, MSU Extension"
I believe this is what happened to an apricot of mine. The symptoms are exactly as described above. I have no idea what the temp was to do this damage nor the variety of tree they are showing. I know for me the coldest was around -23F/-24F.