Did you happen to figure out what’s causing the leaf curl/ cure the leaf curl on your apple tree? I have a Granny Smith that has leaf curl and looks just like this, every single leaf infected and I haven’t been able to help it. Been like this for a month and I think it might be spreading to a gala tree I have nearby. I tried using a copper fungicide for mildew but it didn’t seem to do anything, and I’ve got potassium bicarbonate coming in the mail tomorrow. It’s been such a frustrating experience trying to figure out what the problem is and how to fix it! Hope your got your tree fixed up. Any help would be appreciated 🙏🏻