Powdery Mildew: Treatment and Prevention | Epic Gardening
3/1/2019·Common baking soda that you keep in your kitchen for cooking and baking can be used to prevent the spread of powdery mildew in your garden. Just dilute one tablespoon of baking soda in one gallon of water. Add 1/3 teaspoon of dish-washing liquid to help the solution stick to the leaf surfaces of the plant. Do not save leftover solution.