It looks like a combination of over-fertilization and bacterial black spot. The bacterial black spot won't kill the tree but too much fertilizer will. It's already dropping young leaves, which is a bad sign. The first priority is to remove the fert and flush the soil. If it lives beyond that, then you can address the bacterial issue.

Jeff

Bench him, then trade him.

Wow - thanks so much! Hopefully I can save this guy... (then bench him & trade him out for a better variety). I'll do some digging on curing black spot, though it may not matter if I already over-fertilized. Really appreciate the help.

-Brett

John 3:16 : )