A common rose disease known as Black Spot is a fungal disease forms black spots all over the foliage. Read this article and look at how to get rid of black spot on roses with proper roses black spot treatments.
ROSE SPRAY-helps prevent diseases such as rust, blackspot, and powdery mildew. Mix together: •1-tablespoon baking soda •1-teaspoon mild dishwashing detergent •1-tablespoon vegetable oil •1 dissolved aspirin Add: •1-gallon water Mix together and pour into a spray bottles. Spray roses every 1-2 weeks.