Still battling leaf curl, but looks like we may get a few peaches this year. 
Discussion
I think I may have brought this up before but I just happened to write this note a couple of days ago.
Boron.
The most deficient micronutrient in soils in the world.
Responsible for seed production. Deficiency causes some of the worst plant disorders: Terminal bud death, Laterals dying, and thick, curling leaves are a few.
Who you calling a Boron?!
It a pain to get rid of once you get it. It only affects the leaves when they get wet on emergence so spraying with seaweed and water soluble calcium can help prevent it. I have a nectarine under an overhang because its England so sometimes it never stops raining and I usually forget to do it.