Root rot is a major disease causing significant losses on peanut crop in Abyan governorate. This experimental study was carried out in vitro and in vivo to assess the inhibitory effect of some antagonistic fungi on A. niger and the causal agent of this disease. In the laboratory, Trichoderma harzianum and Penicillium sp. inhibited the radial mycelial growth of the pathogen on agar plates by 72 and 44% respectively. The green fumigant reduced mycelial growth of the disease agent only by 22% after 6 days of incubation at 28±2 ºC. In the greenhouse, seed dressing and soil treatment with Trichoderma harzianumby concentration of 1% (w/w) reduced disease incidence to 5.8% and 8.8% respectively. Treatment of contaminated soil by spore suspensions of the antagonistic fungi by concentrations of 4×106 for Trichoderma harzianum and 3×104 for Penicillium sp. reduced disease incidence to 6.3% and 10% respectively. Application of green Fumigant by concentration of 10% (v/v) reduced affected plants to 25.3% compared to untreated control, where 77% of peanut plants were infected by the pathogen. The differences between those treatments are significant at level of 0.05.
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