Believe it or not, I have had a lot of success keeping powdery mildew under control by spraying a diluted milk solution on the leaves when I first see signs of mildew. I just take a 24-30 oz spray bottle, pour in some milk (a tablespoon or so), and spray tops/bottoms of leaves. It actually really helped! I use it on cucumbers, zucchini, yellow squash, and melon plants.
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