Peach Tree Leaf Curl - Ask Extension
When is the ideal time to use a copper sulfate spray on a peach tree in Eugene, OR?
Knowledgebase
Peach Tree Leaf Curl #891961
Asked January 27, 2025, 12:52 AM EST
When is the ideal time to use a copper sulfate spray on a peach tree in Eugene, OR?
Lane County Oregon
Expert Response
Two fungicide applications are recommended for peach leaf curl, one in the fall at about 50% leaf fall (late October-early November,) and the second in the dormant season just before floral buds begin to open (which is usually in late February). For home gardeners, your best options are chlorothalonil or fixed copper (ex. copper sulfate), and chlorothalonil is the more effective fungicide of the two.
You can find more information on Managing Diseases and Insects in Home Orchards in OSU Extension publication ec631 https://catalog.extension.oregonstate.edu/ec631.
So, we didn’t do a treatment in the fall. Would it do any good to just do the treatment in February this year and do it again in fall of 2025?
Thank you!
Jeanne
On Jan 28, 2025, at 3:54 PM, Ask Extension wrote:
It will provide some control, but will be less effective than if you had done both sprays. Try to get back on schedule by doing a spray now (before the floral buds open), a spray at 50% leaf fall in the fall of 2025 followed by a spray just before bud swell in 2026.
