"If you are seeing powdery-looking patches on the foliage of your plants, you most likely have a case of the very common powdery mildew fungal disease. Here is a simple spray for controlling the spread of the fungus. It won't get rid of the fungus on leaves that already have it, but it will prevent it from spreading to the rest of the plant." Farming & Agriculture
Organic powdery mildew and black spot treatment! You will need; 1 gallon of warm water 3 Tablespoons Baking Soda 1 Tablespoon Murphys Oil Soap The simple recipe; Mix the Baking Soda and Murphys Oil soap in the warm water, stirring well. Spray the solution on both sides of the leaves as soon as you spot this disease. (Gray coating on the leaves or black spots on yellowing leaves).