Infected plants wither and die quickly. QDig plants out immediately. Do not replant peonies in the same spot until at least 3 years after wilted plants have been removed. Leaf Blotch Leaf blotch, or measles, is a disease that usually occurs after plants bloom. Leaf blotch fungus overwinters in dead plants.
Infected plants have small red or reddish-brown spots on stems, leaves, and flowers.
The spots on the leaves later enlarge into purplish-brown blotches on the upper surfaces. Dull brown blotches appear on lower surfaces. QCut plants to the ground in the fall. Remove diseased leaves as they appear in the spring and summer. The spots appear on leaves and stems.