Paeona sp. (Peony) get botrytis and anthracnose. Both diseases cause buds, flowers, leaves, and stems to die. These two diseases often cause similar damage. Culturing is usually necessary for proper identification. Grow in full sun and good air circulation. Fungicides and sanitation are helpful.
Written by James Schuster, Extension Educator, Horticulture, and reviewed by Bruce Paulsrud, Extension Specialist, Plant Pathology and Phil Nixon, Extension Entomologist, University of Illinois at Urbana-Champaign.