Spraying peaches for leaf curl
Can you rotate chlorothalinil with copper spray?
Lane County Oregon
Yes, however copper only has a fair to good rating for controlling peach leaf curl, so I suggest going with chlorothalonil. For peach leaf curl, two fungicide applications are recommended for western Oregon: one in late October/early November (at about 50% leaf fall), and the second just before bud swell (usually in late February, before the floral buds open). Always read the pesticide label prior to use, and follow all instructions.