I have the same problem on my nectarin and peach trees. In the link above says it is peach leaf curl. I want to grow them organically without using fungicide or any kind of chemicals. Is there a way to do that?

Yes don’t spray for peach leaf curl. It won’t effect the fruit. the tree will eventually drop those leaves and put out new ones. If you can dispose of the fallen leaves in trash. All my peaches and nectarines had plc in California and all gave me excellent fruit.

It's not exactly accurate to say it won't affect the fruit--Peach Leaf Curl leaves scabs on the fruit. A mild case won't affect the flavor, though. However, depending on the sensitivity of the variety and how wet the spring is, a bad case of PLC can kill the tree.
There are organic sprays, though, and you should use them if you want a healthy tree." No spray" can mean your poor tree will drop all its leaves and spend its energy making a whole new set of leaves in May/June, instead of making peaches.
Carla in Sac

As with many sprays a critical point when spraying to prevent peach leaf curl is the timing.

Both copper and sulfur based fungicides ARE approved organic controls for peach leaf curl. You spray the tree in the fall after most of its leaves have dropped and again in early spring before bud break. And you can squeeze in a third application in midwinter as well if you feel it necessary.

And repeated incidences of leaf curl can seriously weaken the tree if bad enough and significantly reduce fruit production.

Is there anything I can do about it now? I already went off and trimmed off the infected leaves so it wouldn’t spread, but it is still really rainy here and I feel it’s only going to get worse

Thanks for all good advises.

I’ll check my trees closer to see they need organic spray.

"I want to grow them organically without using fungicide or any kind of chemicals. Is there a way to do that? "

I think the marketing of organic throws people off. You would be using chemicals, just natural ones not synthetic/man made. Some organics can be more dangerous than some conventional sprays. Sulfur and copper are toxic to mammals (us). You don't want to be ingesting that or having it on your skin when you spray. It's recommended to wear long sleeve waterproof clothes, gloves, goggles and a mask when spraying them. Copper will also build up in the soil if you keep spraying year after year. The only place you can get away with no spray peaches is in a climate with dry summers/low humidity like California for example. If you are in a humid place (like I am now in Georgia) you have to spray for bugs & fungus.

Yes my peach trees all had PLC. This is fruit from my tree in the pictures. And they taste as good as they look. (San Jose, CA - Mid Pride picture on Lovell)

There is nothing you can do for leaves which already have the blisters, they will fall off and new leaves should be clean (unless it is non-stop raining)
Carla in Sac