It is late January now and in California we are starting to think about spraying the peaches/nectarines for peach leaf curl. I generally wait until about Valentine's Day and just do it one time. Although lime sulfur hasn't been sold for backyard use for years, the product is still available as a pet mange treatment (at 97 percent or more purity). I just buy the mange treatment, compare the concentrations recommended on the old Bonide lime sulfur container, do a little high school chemistry, and apply it carefully. It works great to control peach leaf curl and I don't have to spray a copper solution all over my trees and yard. If you want a good peach/nectarine crop, you have to address the peach leaf curl. There are other peach leaf curl treatments available at the nursery if you've forgotten your high school lessons.
