No chemical control is listed.
Powdery mildew forms a white powdery coating on the leaves.
If serious apply benomyl according to label directions. 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.