Trichoderma could be a genus of fungi within the fungus family, that's gift all told soils, wherever they're the foremost rife culturable fungi. several species during this genus may be characterised as timeserving avirulent plant symbionts. they're favored by the presence of high levels of plant roots, that they colonize pronto. Some strains area unit extremely rhizosphere competent, i.e., able to colonize and grow on roots as they develop. the foremost powerfully rhizosphere competent strains may be intercalary to soil or seeds by any methodology. Once they are available into contact with roots, they colonize the foundation surface or cortex, looking on the strain. Thus, if intercalary as a seed treatment, the most effective strains can colonize root surfaces even once roots a meter or a lot of below the soil surface and that they will persist at helpful numbers up to eighteen months once application. However, most strains lack this.