White spots/mildew/mold on Squash plant leaves

Asked July 23, 2015, 2:06 PM EDT

The squash plants in my raised vegetable bed have white spots, mildew, or mold on the leaves and stalks. I've sprayed the leaves with baking soda diluted in water but with little improvement. The spots/mildew are spreading. Any suggestions on what I can do?

Deschutes County Oregon

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