You need to have the correct percentage of copper in the spray or it does no
good. When you spray is also critical. Google is your friend!!
http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7426.html

Val

"Ook" Ook Don't send me any freakin' spam at zootal dot com delete the
Don't send me any freakin' spam wrote in message
...
Alas, my peach trees all have severe peach leaf curl already. I sprayed
with a copper fungicide a few times, but it does not seem to have helped.
Has anyone been through this and have any practicle advice - like how did
you get rid of it?