Symptoms mainly affect the leaves, newborn round brown lesions, primary round purple-brown lesions, size 6-15mm, followed by a slightly brownish brown ring pattern, surrounded by dark purple-brown, often with dark green mildew layer on the back of leaves, late lesions Fusion causes leaf blight. Stem disease grows bar-shaped purple brown spots. Petiole infected petioles base part of the fork is easy to break. Sepals and petal infected with diseased purplish red dots, and the back edge scorch.
Pathogen Cladosporium paeoniae Pass. Conidiophores 3-7 clustered, yellow-brown, linear, with 3-7 septa, size 27-734-5 (μm). Conidia are ovoid to spindle-shaped, yellow-brown, one or more cells, size 10-134-4.5 (μm).
Transmission routes and disease conditions: Hyphae and conidia are overwintering on sick and sick bodies. In the middle and late March of the following year, when the conditions are appropriate, the conidia produced first invade the host's lower leaves, and then gradually expand upwards. 7-8 In the rainy season, the disease is heavier.
See control methods for Paeony gray mold.
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