Deuteromycetes are saprotrophs in soil and on decaying organic matter. Most of them become parasites and cause serious diseases in plants, animals and human beings. A large number of Deuteromycetes are decomposers of litter and help in mineral cycling. Some common examples of Deuteromycetes are; Alternaria, Colletotricum, Fusarium, Trichoderma, Cercospora, etc