During their first visit to the property in spring 2009, the Peony Advisory Board discovered Lemoine Disease infecting just over 10% of the peonies. Leaf spot of peony. Cause The fungi Botrytis paeoniae (sometimes called early blight or bud blast) and B. cinerea (sometimes called late blight). Peony leaf blotch is also commonly known as peony red spot or peony measles. Q: When I grew up in Michigan, my mother had peonies that bloomed without trouble. The flowers are fragrant and large, reaching up to 10 inches across, and bloom in various colors. 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. Cause of disease. 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. or larger on leaves, and the foliage may be curled or twisted near the spots. 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. Recognizing Peony Leaf Blotch. I dug up some of the roots and brought them to Georgia. Symptoms include a general dwarfing of the plant, lack of proper chlorophyll Additional species have been found in the PNW including B. pseudocinerea that is resistant to fenheximide. Peony Leaf Disease. 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. By the invasion of pathogens, there will be local necrotic diseases … It is a fungal disease caused by Cladosporium paeoniae. Peony Leaf Disease. Lemoine Disease is a serious disease of peonies. Fortunately, it appears to be uncommon. 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