It is a fungal disease caused by Cladosporium paeoniae. Fortunately the peony suffers from few diseases and is only rarely troubled by pests. Lemoine Disease is suspected to be caused by a virus. Cause of disease. Symptoms include a general dwarfing of the plant, lack of proper chlorophyll Q: When I grew up in Michigan, my mother had peonies that bloomed without trouble. Hosta virus X on peony A. Phibbs, DATCP, Bugwood.org Tobacco rattle virus on peony A. Phibbs, DATCP, Bugwood.org Viral Diseases Peonies are subject to a variety of viruses including peony ringspot virus, leaf curl, Le Moine disease, crown elongation, and mosaic. Recognizing Peony Leaf Blotch. I have been unsuccessful in getting them to bloom. I dug up some of the roots and brought them to Georgia. Lemoine Disease is a serious disease of peonies. Leaf Blotch – Also known as peony measles or peony red spot, this is a fungal disease caused by the pathogen Cladosporium paeoniae.Symptoms are red to purple colored blotches an inch (2.5 cm.) The flowers are fragrant and large, reaching up to 10 inches across, and bloom in various colors. Peony Leaf Disease. Inoculum of B. paeoniae will be from previous or nearby peony crops while that of B. cinerea could be from any of its over 250 hosts. It is, in fact, one of the most trouble free plants of the garden and where grown well, so that growth is strong and vigorous, only on rare occasions will an outbreak of disease occur. Peony Leaf Disease. Additional species have been found in the PNW including B. pseudocinerea that is resistant to fenheximide. Symptoms on peonies with measles include red to purple spots on the upper sides of peony foliage, brown spots on the under sides of leaves, and red to purple streaks on stems. During their first visit to the property in spring 2009, the Peony Advisory Board discovered Lemoine Disease infecting just over 10% of the peonies. In the early stage of leaf spot disease, there will be a lot of small dark brown spots on the leaf surface, and then they will gradually expand, and form irregular wheel lines, and finally produce black mould spots. Cause The fungi Botrytis paeoniae (sometimes called early blight or bud blast) and B. cinerea (sometimes called late blight). Leaf spot of peony. Fortunately, it appears to be uncommon. or larger on leaves, and the foliage may be curled or twisted near the spots. Peony leaf blotch is also commonly known as peony red spot or peony measles. By the invasion of pathogens, there will be local necrotic diseases … Peony Leaf Disease Peonies are herbaceous perennials, meaning when the plant goes dormant in the winter, the leaves fade away to reappear in the spring. 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