On older plants the foliage is mottled light yellow. Several leaf spots may be found but are not serious. Remove and destroy infected leaves. Powdery mildew may cause a white powdery growth on the leaves in late summer.
White smut causes light spots on the leaves.
Destroy plant residues in the fall and get rid of infected plants as they are noticed. Verticillium wilt may kill Rudbeckia. 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.