What is the white stuff on my zucchini leaves?

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Tags

1. #mildew
2. #leaves
3. #these
4. #powdery
5. #plants
6. #other
7. #coloration
8. #white
9. #blotches
10. #produce
11. #cause
12. #appearance
13. #naturally
14. #large
15. #their
16. #zucchini
17. #squash
18. #fungus