To prevent powdery mildew on your zucchini you can mix 1/2 cup of milk (even of powdered once it is mixed according to directions) with 4 and 1/2 cups of water and spraying the zucchini plants once a week. Why lose them to powdery mildew when it is this easy to prevent that loss.
When your zucchini make it and you have plenty try this way of using them. Make Zucchinni Noodles.
How To Make Zucchini Noodles or Ribbons