Abstract
Leaf spot and blight disease of tree peony (Paeonia suffruticosa Andr.) was found in an apartment garden in Daegu in May 2003 for the first time in Korea. The causal organism was identified as Phytophthora cactorum (Leb. And Cohn) Schroeter. The causal fungus was homothallic, and produced distinctively papillate, ovoid to subspherical, and caducous sporangia with pedicel. Sporangia that formed in water measured 23.4-42.921.5-35.1 in range with an average of 35.34.626.936.0 , I/b ratio
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