biocontrol mechanism of trichoderma harzianum is best described by
Trichoderma Several strains of Trichoderma have been developed as biocontrol agents against fungal diseases of plants.[7] The various mechanisms include antibiosis, parasitism, inducing host-plant resistance, and competition. Most biocontrol agents are from the species T. harzianum, T. viride and T. hamatum. The biocontrol agent generally grows in its natural habitat on the root surface, and so affects root disease in particular, but can also be effective against foliar diseases.