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[Alan Haigh <alandhaigh@gmail.com>]

I actually don't have a ton of experience controlling peach leaf curl because I usually let it run its course.  On sites where I've had any problem it has been sporadic on usually just a single tree and isn't enough of an issue to add another spray to the sched.  When I have treated it it has been with Bravo (chlorothalonil) which is one chemical Cornell prescribes for this disease.  Others are Echo, C-O-C-S or other copper formulations, Ferbam, Kocide and Ziram.  For all these materials a single application is recommended while tree is still dormant in Spring.  

 

On trees I've treated I haven't had a return infection- but I could say the same about most of the trees I've left untreated, which is the vast majority.