I have a problem with one of my Acers (a Shaina) and wanted to see if anyone could help identify what has gone wrong. It is fairly young, it was in the ground after I planted it last October after leaf drop and it looked very healthy. I took my eye off it a bit but watered it, it was in a sheltered, shady spot that isn’t very dry, around other trees - but last week I noticed dead portions on the branches and dead/burnt out buds on those branches. I cut back those branches but see here, at the point of the cut there’s a black stuff inside the stem cross section right down low. Any ideas?