Could not find any recipes for organic sprays, such as the one using hydrogen peroxide. Where do I get that information?
Powdery Mildew Sprays
1 gallon of water
1 tablespoon of baking soda
1 tablespoon of vegetable oil
1 tablespoon of dishwashing liquid
Mix the ingredients together and add them to a spray bottle. Spray your plants weekly, preferably on overcast days to prevent it from burning the foliage.