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Efficacy of Bioagents and Plant Extract against Alternaria porri Causing Purple Blotch of Onion
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The bioagent T. harzarium was found most effective in controlling the pathogen. Lowest disease severity (37.67%) was recorded in the spray treatment of T. harzarium. It was followed by T. viride and P. fluorescens, B. subtilis. Among the plant extract 5 per cent neem seed kernel extract gave maximum control of pathogen i.e. 44.24 per cent over control, followed by Followed by Mentha arvensis, Allium sativum, Zingiber officinale, Vitex negundo. The fungicide Mancozeb was at found at par with extract of NSK and Mentha arvensis.
Keywords
Onion, Purple Blotch of Onion, Bioagents, Plant Extract.
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