Can I spray with sulfur now? My nectarine and peach both have curl.
Peach Tree Curl
Certified GKH Gardening Expert
Here is an article about peach tree curl that will help you:
Spraying is usually ineffective once peach leaf curl presents itself. You will want to apply a fungicide spray in autumn following leaf fall or just before budding in spring to prevent the onset of peach tree curl. In terms of fungicides, fixed copper products are most effective while fungicides which include lime sulfur and copper sulfate are less so.