Answer: Sounds like a classic case of the fungal disease called powdery mildew. It attacks most frequently when days are warm and nights a cool - typical early fall weather. Since it is so late in the growing season, I'd suggest pulling out the plants and starting new next spring. Find the sunniest spot possible for your squashes and plant them as early in the season as possible to ensure you'll have lots of zucchini all summer long. Enjoy your garden!
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