Tiny red to purple spots appear near the veins of the peony leaves. Apply a fungicide to protect plants. Leaf Blotch. The disease may cause slight distortion of the leaves as they continue growth. Red Spot, Leaf Blotch, or Measles of Peony; July 29, 1998: If you have seen peonies, you have most likely seen this disease. This disease generally appears in spring or early summer when the shoots of affected herbaceous paeonies wilt and turn brown for no apparent reason. Remove infected plant parts. On peonies afflicted with botrytis, the young shoots rot off at ground level when they are 5 to 8 inches tall. Infection of peony can occur from 50°F to 82°F but the latent period increases as the temperature declines. Lesions are also formed on stems. Clean up debris at season end. The underside of each spot is reddish-brown in color. The rotted portion of the plant will become covered with a soft brown or blackish mass of spores. This fungus only attacks Paeonia spp. Leaf blotch is a result of the fungus Cladosporium paeoniae. Peony wilt is an infection of the leaves and stems of peonies and tree peonies by the fungus Botrytis paeoniae, which is closely related to the grey mould pathogen Botrytis cinerea. See: Peony (Paeonia spp. Cause Graphiopsis chlorocephala (formerly Cladosporium paeoniae), a fungus that can impact all aboveground tissues and survives in stem and leaf debris.It has been reported from Washington and found in Oregon. The stems often have a water-soaked, cankerous appearance. Nematodes Cladosporium paeoniae: Avoid overhead irrigation. Peonies are relatively disease and pest resistant plants, however there are a number of ailments that gardeners should be aware of. Peony leaf blotch is caused by the fungus Cladosporium paeoniae. The disease is caused by a fungus, Cladosporium, that grows superficially on leaves, stems, and petioles, causing unsightly spotting but not significantly affecting plant vitality. Leaf Blotch (aka Measles) Cladosporium paeoniae. Diseases that commonly afflict peonies are associated with lack of air movement and cool wet conditions, minimizing these factors may be difficult, but recognizing them can allow them to be addressed. Leaf blotch or measles: Small, reddish spots that can coalesce to form large, irregular purple blotches on leaves and stems. The leafy shoots wilt suddenly and fall over. Peony > Leaves > Spots on leaves. It goes by many names, but red spot seems most descriptive. 1 of 5. Maintain low humidity. The leaves of peony plants sometimes fall victim to a disease called peony leaf blotch, which causes dark or red spots to form on the leaves. )-Peony Red Spot. Symptoms. The disease is also known as red spot or measles. 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