Our flourishing squashes
I have a large vegetable garden and this year our squashes were riddled with powdery mildew.
I diluted 250ml of vinegar in 5 liters of water and sprayed the ground around, leaves and stems with this dilution every day for 1 week.
Thereafter we didn't battle with mildew on those plants again.
More on our gardening blog here http://its-our-life-for-six.blogspot.com/