Using the dual culture method, the in vitro antagonistic capacity of Trichoderma species T. atroviride, T. hamatum, T. harzianum, T. longibrachiatum, and T. viride against Fusarium oxysporum f. spp. capsici was assessed. T. hamatum was found to be the most effective in inhibiting Fusarium oxysporum f. spp. capsici mycelial development, with 70.15 percent inhibition, followed by T. atroviride, T. harzianum, T. longibrachiatum, and T. viride, with 67.18 percent, 68.75 percent, 69.46 percent, and 66.75 percent inhibition, respectively. By using spore suspension (1106 conidia/mL), the antifungal ability of five Trichoderma species was further assessed in-vivo. Under greenhouse conditions, T. longibrachiatum treatment resulted in a disease severity of 24.7 percent. T. longibrachiatum also increased root and shoot length and weight. Fusarium wilt was moderately regulated by the other Trichoderma species. Overall, T. hamatum and T. longibrachiatum were the most successful treatments for Fusarium wilt control in vitro and in vivo, and it depends on the plant species' disease tolerance.
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