Dark brown lesions form on the branches at the nodes, these later turn ash gray. As the spots enlarge and girdle the stem the parts above wilt and die. Remove and destroy infected plants when seen and destroy plant residues in the fall. Leaf spots may be an occasional problem. Remove and destroy spotted leaves.
Powdery mildew coats the leaves and small branches with a white powdery growth.
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. Please read our disclaimer for important information about using our site.