Diagnosis
Diagnose: Powdery Mildew on Black-Eyed Susan
Follow these steps to identify and confirm the problem.
- Powdery mildew growing on the leaf surface
- Look for white to gray powdery patches or felt-like mats that expand on living Rudbeckia tissue. A few late-season patches are often cosmetic, while early spread onto young leaves or buds deserves closer management.