The filamentous ascomycetous fungi Trichoderma spp. are agriculturally and industrially important, being the major source of many commercial enzymes and as biofungicides. More than 60% of all registered biofungicides used for plant disease control are Trichoderma-based. Mycoparasitism, wherein one fungus directly kills and obtain nutrients from other fungi is considered to be one of the most important mechanisms of biocontrol.