GAH. Last year I lost all my zucchini and pumpkin plants to powdery mildew. I tried the organic method of PM control recommended by my local garden center: copper soap. It did a whole lotta nothing.
It's back. And this year I want it GONE. I have a fungicide for roses but it specifically states that it's not meant for edible plants.
What is your favorite fungicide for destroying powdery mildew on edible plants?