Everything I find online talks about treating it before or after there are leaves. What can I do now?

Remove the leaves and burn them. They can infect your trees again if you improperly compost them, or they can infect someone else's trees if you throw them away. Clean your pruners with a bleach water solution or rubbing alcohol any time you prune the tree. Next winter after leaf fall, follow up with a fungicide treatment. It's an ugly fungus but manageable for most of us.

Pick off infected leaves. New leaves may not get infected. Fungus that causes PLC are around waiting for perfect timing (cool, wet spring weather) to show up. If your spring continues to be cool and wet, the infection will continue. If your weather is dry and warmer, the infection will subside.

To prevent it, in fall ( all leaves are gone) or early spring when leaves are still totally dormant, spray with copper. One spray and it should work.

Pick off the leaves. I sprayed Neem oil in season last year and it helped. As was suggested use dormant spray next year. The tree is going to be fine! The best tasting fruit always require that little extra work but well worth it.

Empower,

i have not seen any info stating that neem oil prevents peach leave curl, not even on neem oil label. In your situation, possibly after you picked offf infected leaves, the temp got warmer and drier so no more infection, not because of neem oil. Copper is what consistently recommended.

If you live in an area where it is warm in the spring, you may not have much an issue with PLC.

Maybe it was coincidence but it seemed to work. I'm thinking I'll do copper this off season.