The photos are of a vilmori mountain ash. It was loosing upper limbs and looked so unhealthy we cut it down. I want to plant a Saskatoon very close to where it was and am concerned that a soil borne disease could have caused the vertical trunk splitting ( before the sapsuckers had their way with it) It is not sun scald as it was in a shady area that gets very little sun. The other reason google gave was wet conditions following dry conditions. There was a rhodo next to it and whenever it started to wilt in the summer, it was watered..