This is most likely brown rot. Brown rot is a fungal disease which can be controlled with regular fungicide applications. Retired UT Extension Agent Mike Dennison gives a schedule for spraying in Tennessee. (Check with your local Extension Agent for the schedule in your area.) Mike also talks about when to mix insecticides with the fungicide to prevent damage from the plumb curculio. He also gives information on how to spray for the peachtree borer.
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