herefore, metabolites produced by Trichoderma spp. (e.g. volatiles, extracellular enzymes and/or antibiotics) were considered to be the probable elements involved in antibiosis. Trichoderma spp. have been also effective in cases of a wide host range and in hindering the longevity of sclerotia of pathogenic fungi. Recently, Szekeres et al. [57] have reviewed antagonistic metabolites produced by Trichoderma spp. The metabolites are linear, amphipathic polypeptides, namely, peptaibols and peptaibiotics. They also discussed the physico-chemical and biological properties of these antibiotic compounds which included the disruption of lipid membranes, anti-microbial activities, and induction of plant resistance.