This late in the year, I wouldn't treat, in part because fungicides are designed to protect new growth against infection.

The other reason -- the leaves will soon fall anyway.

Can you post pictures? Perhaps we can help determine if it's powdery mildew.

Or take a leaf sample to someone else for another opinion. (Just ask what's happening. Don't give them any hints about what you have been told.)

Jean001, Thanks for the response. I'll try to figure out how to post a picture. they are just folding in from the leaf stem to the tip of the leaf. (lengthwise) Do you see any problem with treating with baking soda solution to raise the PH at this point? Thanks, Luke

Is it Peach leaf curl ? http://www.caf.wvu.edu/KEARNEYSVILLE/disease_descriptions/omplfcrl.html. Would also like to add that any fungus based disease, the leaves on the ground must be gathered, removed, & burned. Fungus creates a spore issue when it rains or plants are watered. It splashes up onto the tree/shrub/plant and re-introduces itself. GreenCure has a good product for fungus. Wettable Sulfur works similar too. Just wait until the leaves drop, then clean up.

Here is a link that might be useful: Green Anything !

To me it sounds like normal dormancy approaching and I would not do anything but prepare for dormant spraying when the leaves drop. Al

Ok, Maybe it is just normal dormancy coming of time. I hope.
This is my first experience with peach trees. I'll still try to post some pics. later. Thanks to all. I'll be back. Luke

Luke, my trees that are more stressed (the ones I transplanted this spring) are showing the same thing right now, and it is common as dormancy approaches. So I'm pretty sure Al nailed it.

Scott

I agree that it sounds like the tree is shutting down for winter.

"Is it Peach leaf curl?"

Peach leaf curl almost exclusively occurs on the first flush of leaves. Subsequently, infected leaves fall off. It's too late in the season for peach leaf curl. Any affected leaves would be long gone by now.

I agree it is a good idea to spray for it though. Because the pathogen infects the tissues very early in the season (bud swell) dormant sprays are the only ones recommended. Copper or chlorothalinil sprays are generally considered the most effective for PLC.

It doesn't look like peach leaf curl. I'm convinced that it is just a natural dormancy thing going on. Maybe I should make another posting, but is there a difference in dormant oils? Any better than others? Thanks again, Luke