Things seem to go south pretty quickly when we don't have the time to spend gardening. The powdery mildew can be a real problem. This year I treated our squash plants with a new product that I have used in the past on our Walnut trees.
The product is Neem oil. Despite it being totally organic, I still use it very infrequently.
Here is a link for the product. It has many uses and I have had very good results using it on the Walnut trees.
I thought that only worked on pests. I'll definitely have to look into it. So you have to reapply regularly?
It's safe to apply whenever needed, but with as good as it works, I only needed to apply it twice over a week's span to totally eliminate the powdery mildew. I did catch it early before it got really bad and within a week it was gone. When I use it for pest control I only use it when I actually see the bugs.