scab disease on peach tree
I don't think this is scab although your peaches may have that as well. What you have is bacterial spot. This disease overwinters in buds, twigs and cracks in the bark. If you had it last year you will have it this year and unfortunately next. When the tree is dormant in early spring spray with copper. Peaches don't tolerate copper all that well so you need to apply when dormant and then a
few applications as the buds are breaking and foliage is coming out.
There are new peach cultivars showing fair resistance to the disease. Contact mail order fruit tree nurseries and select only those with bacterial spot resistance.
Please call our office and request a Home Fruit Spray Schedule.
Healthy trees are less likely to be damaged by this disease. Make sure you are fertilizing and irrigating as needed.
Unfortunately once the disease is evident there is little you can do to correct it during the growing season.