I've not heard of the foil wrap, and will have to try that. I also have all the pests /diseases you mentioned.

I have had excellent success with raw milk in a 10:1 water:milk ratio sprayed once a week to curb/cure mildew. I use it not only on the squash but also bee balm, lilac, phlox, and others. This is the 3rd year I've used it.

And my experience with the mildew is that the drought years have actually be the worst. Knock wood, right now I have NO mildew and it's been raining for weeks here. Haven't sprayed in 2 weeks because of rain and vacations. Will resume spraying next week, weather permitting.