Figure 2: In vitro relative radial growth inhibition of Alternaria solani mycelial growth on PDA plates by the different Trichoderma isolates i.e., T. hamatum (Th), T. viride (Tv), T. harzianum (Tz22), T. harzianum-T10, Trichoderma sp. (T32) and T. koningii (Tkg). The relative growth inhibition was calculated by subtracting the radial growth of Alternaria solani in the direction of the biocontrol agent from the radial growth of Alternaria solani in the absence of a biocontrol agent (control) divided on radial growth of control , (n=3).