Downy Mildew starts on the undersides of leaves and it causes yellow spotting on the top sides of your squash, zucchini and cucumber plants. It likes 85%+ humidity and cool days or nights of 65-75 degrees F. It spreads by spores that establish in 7-10 days. It likesd water/moisture to spread. I should be sprayed about every 7 days until controlled.
Check out my vegetable gardening blog: The Rusted Garden. It is filled with garden information, videos, pictures, seed catalogs and seeds & things I sell. www.therustedgarden.blogspot.com
Join My Google+ Gardening Community called Our Tomato & Vegetable Gardens – we are approaching 5000 world-wide gardeners: … or Link from My YouTube Page.