New apple tree already sick...

I just planted an apple tree (dwarf liberty) a few days ago, and I've noticed some discolored yellow leaves with green spots. Online research suggests it could be Marsonnina leaf blotch disease. What are some Permie-friendly ways to help the tree recover?

I had that going on with my honeycrisp trees the first year I planted them. The nursery said I was watering too much.  Year two and three, we are great.

That is comforting to hear. Thanks!

It's good to contact the place where you got the tree.  Most nurseries offer a 1 to 12-month guarantee and troubleshooting.  

I'm also wondering if it's water or weakness from transplant shock.