摘要 : Efficacy of biocontrol agents and soil organic amendments was evaluated for their potential to manage the basal rot of onion caused by <i>Fusarium oxysporum</i> f.sp. <i>cepae</i>. <i>Trichoderma viride</i>, <i>Trichoderma harzian... 展开 Efficacy of biocontrol agents and soil organic amendments was evaluated for their potential to manage the basal rot of onion caused by <i>Fusarium oxysporum</i> f.sp. <i>cepae</i>. <i>Trichoderma viride</i>, <i>Trichoderma harzianum</i> and <i>Pseudomonas</i> sp. were collected from different onion growing areas of Tamil Nadu and were tested for their antagonistic activity against the pathogen by dual culture technique. Among the tested isolates of <i>Trichoderma</i> sp., <i>T. harzianum</i> (TH3) recorded the maximum (82.77%) inhibition. Among the sixty two isolates of <i>Pseudomonas</i> sp., Pf 12 significantly exerted the highest (74.68) per cent reduction of mycelial growth of pathogen. Among the organic amendments, <i>mahua</i> cake (10%) significantly recorded maximum 61.00 per cent reduction of mycelial growth over control. 收起