1 tablespoon of baking soda with half teaspoon of liquid soap and 1 gallon of water is mixed together and sprayed over the infected area to reduce the occurrence of powdery mildew. This is useful to prevent the disease, but is less effective once the disease has started.
When baking soda is sprayed on plants, it disrupts the ion balance of fungal cells, which causes them to collapse. Also, fungal spores are eliminated because the baking soda leaves alkaline residues on the surface of plants. Apart from acting as a fungicide, it has several other benefits in the garden.
