Peony Anthracnose

Peony anthracnose is caused by the fungus Gloeosporium. Symptoms seen in these photos include leaf spots, dieback, and dark lesions that may girdle stems.
Masses of salmon-colored spores may be observed in leaf spots and lesions. Buds and flowers may also be affected.

Prevent peony anthracnose by improving air circulation.
Avoid overhead watering. Remove and destroy all infected plant parts.