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Powdery mildew on nectarines

last year

It seems some of my nectarines are infected by powdery mildew. A couple pics below:

I sprayed them a couple times with a mixture of baking soda, vegetable oil and dish soap that I found online. Not sure if its really helping them. How can I manage this? Either with household products or something I can buy? I assume copper fungicide directly on the fruit is not a good idea.

Also, some of the fruit are having this reaction. What is going on here and is this fruit no longer good?

Finally, some of the fruit has a less severe problem and is just kind of bumpy and slightly yellow. Is this fruit OK?

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