Stone fruit are turning mouldy on a healthy tree?
I have two peach trees, and they have flowered well with good fruit set, but as the fruit has matured several of the peaches have become shriveled and moldy.
Certified GKH Gardening Expert
I recommend dormant spraying with a horticulural oil and copper fungicide. And then during fruit set start preventive treatments with a biological fungicide like this:
Good soil fertility and water management will help the trees and fruit resist diseases and pests.