A general leaf spot spray is basic copper sulfate. Blight or gray mold attacks the flowers, flower buds and leaf tips. Symptoms on flowers are small water soaked spots which enlarge rapidly, followed by development of a gray mold. Infected plants and plant parts are removed and destroyed. Applications of benomyl or chlorothalonil will control this disease.
Powdery mildew causes a powdery white coating on the leaves.
This disease is controlled with benomyl or sulfur. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension. Reprinting cannot be used to endorse or advertise a commercial product or company.