I'm also curious about brown-rot resistance in stone-fruit. This is going to be very regionally specific, I'm afraid, but maybe we can all learn something. I have read that the Seneca plum is resistant but not found this to be true. I have observed that in peaches older varieties seem to have more resistance. Encore, Autumn Glo and Lady Nancy tend to rot without significant protection but Elberta and Belle of Georgia do not.
In southeastern NY earlier ripening stone-fruit that face less heat and humiditity suffer less from brown-rot and peaches less from scab.
So many of the newer peaches are highly susceptible to brown-rot that I think we should limit the discussion to what's resistant, not what's not, unless it's a variety that seems to exist to rot. In newer peaches, varieties from the Harrow series are evaluated for brown-rot resistance but they are falling out of popularity.
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