Homemade Baking Soda Spray Now Black Spots!
I made a homemade spray for my tomatoes for early blight with baking soda, water, oil and dish soap. I removed the yellowing leaves and then sprayed the remaining with the mixture last afternoon. I went out today to find black spots forming on the leaves. I'm thinking their frying in the sun so I placed under an umbrella for shade until I can figure this out.