Reviews the use of selected mycoparasites to control soilborne plant pathogens and explains why some biocontrol agents probably will never become a practical reality and why others have a chance to become commercially feasible. Trichoderma spp. and Gliocladium virens have some potential for use in biocontrol under certain conditions and are discussed. Other mycoparasites reported to have some potential for biocontrol are Coniothyrium minitans, Laetisaria arvalis, Pythium nunn, Talaromyces flavus and Sporidesmium sclerotivorum, and these are also discussed. -Author