Trichoderma sp.(strain H921)was isolated from the fruiting bodies of wild mushrooms and evaluated for fungicidal activity against plant pathogenic fungi. When spores of the plant pathogenic fungi Alternaria alternata Japanese pear and tomato pathotypes), Botrytis cinerea, Colletotrichum orbiculare, Corynespora cassiicola, and Fusarium oxysporum f. sp. spinaciae were incubated in culture filtrates of strain H921 and incubated onto glass slides, spore germination of these fungi was significantly inhibited.