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Fungicidal activities of Cassia obtusifolia extractsand their active principles were tested against Botrytis cinerea,Erysiphe graminis, Phytophthora infestans, Puccinia recondita,Pyricularia grisea, and Rhizoctonia solani, and comparedwith synthetic fungicides and two dihydroxyanthraquinones.At 1 g/l, the chloroform fraction of C. obtusifolia extractsshowed fungicidal activity against B. cinerea, E. graminis, P.infestans, and Py. grisea, and the ethyl acetate fraction showedfungicidal activity against E. graminis and P. infestans. Danthronewas chromatographically isolated from the chloroform fractionand showed fungicidal activity against B. cinerea, E. graminis,P. infestans, and Py. grisea with 68, 100, 78, and 91%control values at 0.5 g/l, respectively. Specifically, alizarinand quinizarin inhibited E. graminis, P. infestans, and Py.Grisea, but did not inhibit the growth of P. recondita and R.solani. These results indicate at least one of the fungicidalactions of danthrone.