I have light powder you cant see it that much but rather start treating it now then later. I know about senerade,Also neem oil and sulfur burining but I am running low on cash so i wanted to know if anyone has used or if this recipe is recommended for treatment. To control powdery mildew on plants, mix together: 1 tablespoon of baking soda Â½ teaspoon of liquid soap 1 gallon of water Do not store unused mixture. While this recipe has been known to be effective, it can burn the leaves of some plants. It is recommended that you water your infected plants well a couple of days before applying this mixture, and don't apply it in full sun. Try on a small area first, to test the plant's response before spraying the entire plant. Some recipes also recommend applying 1 tablespoon of ultralight horticultural oil to the mixture. The oil coats and smothers the fungi. The soap is added to help the mix spread and cling to the leaf surface. Be sure to apply to lower leaf surfaces as well.