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Originally Posted by Sherry_AK

Looks like powdery mildew to me as well. I used the milk spray when I had an outbreak in 2016 (on all 100+ tomato plants). I sprayed gallons of milk. All I did that summer was spray milk solution. I had moved the plants out of the greenhouse for better control (all are grown in containers), but I never once smelled sour milk. I think it air dries so quickly that no odor can develop.

Did it help?