This is an O’Henry on Lovell. Photos of the dying tree and the diseased-looking rootstock below. This is from a week or two ago; it seems really dead now. This looks very much like what happened to my Harcot on Myro 29c earlier this year, not long after leafing out.
The bark kill at the base looks like what happens when I prune a young peach tree very severely before winter. It doesn’t have to be a really cold winter to kill bark if the cut is big enough. Looks like they took a big hunk out of that tree, judging by the cut.
I have always a concern about black pot and well drained soil. Anything I put in a black pot seems to be too hot when summer arrives. Well-drained soil is too well-drained!!! I wonder with the pot and the condition, how much it contributed to the demise of your young tree.
Yeah I have a lot of black pots too, and it is a problem, but I never found the fabric to be a problem at all no matter what color. Yes, dries really quick, but does not hold much heat. I would at least use more soil here, too. That soil looks excellent btw! It may be not enough watering?