Powdery leaf mildew
Is there anything I can do to prevent it? For the last two years my zucchini plants have suffered through it. I spray with baking soda water and remove the affected leaves. I stake it and tie it up as it grows so it isn't laying on the ground. I lost two pumpkin plants to it the first year (they were just spreading out on the ground and it took a while to figure out what it was that was killing them). My zucchini did okay last year in spite of the powdery mildew, but they could produce so much better and it's such a hassle to keep on top of it.
I'm planting a different variety of zucchini this year, but I'm trading seeds with my sister, so I don't know what specific variety it is or whether it is resistant to powdery leaf mildew.
Is there anything I can do proactively to avoid it this year? I can't really move my zucchini to a different part of the garden without putting some other squash in its place - we rent and I have very limited garden space.