Hi,
I have a nectarine tree that I've been having a problem with leaf curl over the last 3 seasons. This year I discovered Neem Oil. What a difference! I had tried various fungicides, soaps, etc with little difference. Now with the Neem Oil, after the first spraying I noticed a distinct result. The tree actually looks alive again! It really was a great improvement. Hope this helps any of you having such a problem.
Muriel