Results showed that all the four Trichoderma isolates showed growth-promotion effect on tomato seedlings. The Trichoderma treatments showed significantly (P < 0.05 or 0.01) higher values of leaflet number per plant, seedling height, stem diameter, fresh weight per plant than the control treatment (Table 3). Isolates T-35, T-51 and T-68 had significantly (P < 0.01) higher values of dry weight per plant than the control treatment. Moreover, isolates T-51 and T-68 had significantly (P < 0.01 or 0.05) higher values seedling health index than the control treatment (Table 3). In contrast, isolates T-21 and T-35 did not significantly (P > 0.05) differ from the control treatment in seedling health index.