Ruby:

Sure I have an idea what's wrong. You planted at the wrong time of year. Fruit trees should be planted in early spring, very late fall, or anytime during the winter that the soil is not frozen. July is just about the worst possible time to plant, even if the tree was containerized, and even in cool Minnesota.

The only thing I can think of that might give your new tree a chance is to prune it way back to prevent transpiration from the leaves, and continue to supply water. But that may not work. Next time, plant in the right season.

Don Yellman, Great Falls, VA

I was thinking along the same lines. I don't know what lake effect does for you, but just going by zones July is tough to pull off in 5A and you're in 5B.
It's not hopeless, I've managed late plantings but you have to keep a hose running on it a lot, which is exactly what the greenhouse would be doing through the summer if you hadn't bought it.

And I agree, that's an awful lot of growth for a new tree. It's been a long time since I've got a real balled and burlapped tree that came with any substantial root system. Most from locals are just bare roots they stuck in some dirt while the sell them. They manage to put on feeders but not enough to feed the amount of growth they leave to get you to buy.
Your top is probably way out of balance for the root system. (And that's something coming from me because I'm always leery of bare root whips.)

Whether you try and prune it to save it or let it go is up to you. You should have a 1 year guarantee on it. You might even go back to where you bought it and ask them what they suggest since they are the ones giving the guarantee.
Whatever you do, save your receipt.