Black Spots on Roses? Combine a teaspoon of dish soap with a teaspoon of vegetable oil in your spray bottle, and fill completely with water.Lightly shake, and then liberally spray this anti-fungal spray all over your roses, leaves, blooms and all.
blackspot remedies, a spray composed of one part milk and two parts water is the best answer to the disease. This simple solution, if applied weekly, will control blackspot as well as any synthetic fungicide, including Chlorotalonil.
Black Spot On Roses: What To Do And How to Prevent It