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Trichoderma species T. atroviride, T. hamatum, T. harzianum, T. longibrachiatum, and T. viride were evaluated for in vitro antagonistic potential against Fusarium oxysporum f. spp. capsici using the dual culture technique. In vitro results revealed that T. hamatum was the most potent in reducing the mycelial growth of Fusarium oxysporum f. spp. capsici with 70.15% inhibition followed by T. atroviride, T. harzianum, T. longibrachiatum and T. viride with 67.18%, 68.75%, 69.46% and 66.75% inhibition, respectively. The antifungal potential of five Trichoderma species was further evaluated under In-vivo conditions by applying spore suspension (1×106 conidia/mL). T. longibrachiatum treatment showed the minimum disease severity of 24.7% under greenhouse conditions. T. longibrachiatum also promoted the length and weight of root and shoot. The other Trichoderma species showed moderated control of Fusarium wilt. Overall, T. hamatum and T. longibrachiatum were the most effective treatment for the control of Fusarium wilt under in- vitro and in-vivo conditions and generally, it depends on plant species tolerating disease.
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