Abstract
Basal rot of onion caused by Fusarium oxysporumf. sp. cepa is one of the most serious soil borne diseases causing significant yield loss of up to 50 per cent. Efficacy of various biocontrol agents was evaluated for the potential to manage the basal rot of onion in vitro. Among the tested isolates of Trichoderma viride (Tv5) gave the greatest (82.86%) inhibition and Pseudomonas fluorescens (Pf 2) exerted significantly the greatest (80.82%) reduction of mycelial growth of F. oxysporumf. sp. cepae. Based on the laboratory analysis, effective biocontrol agents were evaluated in glass house conditions. Among the nine treatments tested in the field by RBD, the combination of bacterial and fungal biocontrol agents and Glomusmosseae (Tv5 +P£2+G.mosseae) gave significantly the greatest (89.49%) disease reduction. These biocontrol agents were useful as an alternative to chemical control of the onion basal rot and to enhance growth and yield of onion. Keywords: Onion, basal rot, Trichoderma viride, seudomonas fluorescens, Glomusmosseae
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