No chemical controls are listed.
Powdery mildew coats the leaves with a white powdery growth.
If serious use sprays of benomyl. 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.