White spots on rose bushes are an indication of a fungal disease such as powdery mildew. Several sprays are available to both treat and prevent fungal diseases on roses.
About the Author
Anna Aronson began working as a journalist in 2000 and spent six years at suburban Chicago newspapers before pursuing freelance work. She enjoys writing about health care topics, in particular obstetrics, pediatrics and nutrition. She received a Bachelor of Arts in journalism from Eastern Illinois University and is now studying for a Master of Science in medicine degree to become a physician's assistant.