thanks, those reports are helpful. I guess we’re all looking for the same thing, a silver bullet variety that doesn’t need sprays. I’ve never seen any kind of controlled testing comparing peach varieties so everyone’s experience is going to be a little random
my study of the ag extension guides was interesting. here are two tests of copper vs. ziram:
you can see that copper is better than nothing but ziram is on a whole other level. the other common recommendations are lime sulfur and chlorothalonil. here are the guides I found:
rates lime sulfur and ziram “excellent” and copper “fair to good”
OSU
UC
UC IPM: UC Management Guidelines for Peach Leaf Curl on Nectarine “… ziram, chlorothalonil (Echo or Bravo), and dodine (Syllit) when applied at the optimal time. Ziram is most effective.”