May 18, Environmental causes would be the next likely culprits for peach fruit falling off a tree. Late frost or even unusually cold, but not freezing, temperatures can result in a peach tree dropping fruit.
High humidity as well as excessive spring heat can produce the same effect. Jul 23, Why Peaches Fall Off the Tree Early. Peaches (Prunus persica) can be grown in U.S. Department of Agriculture plant hardiness zones 5 through 9. The peaches rotting in the bag are probably rotting due to brown rot, so it does sound like the fungus is present.
The only thing about your description that doesn't quite add up is the way the fruits are falling off before my peaches are falling off the tree ripen.
When you have brown rot they usually don't drop early, and in fact they can"mummify" on the tree, turning all. Aug 27, That is when I start my first thinning here but on commercial Peaches. You may even have to thin every 3 weeks to generate any real size to the fruit but I must caution you that many dwarf Peaches also produce dwarf fruit. It is quite common in what we call the dwarf"Water Peaches", the white colored and unusually watery fleshed dwarf Peaches.
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