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Potential of biocontrol agents against basal rot of onion caused by Fusarium oxysporumf. sp. Cepae
Authors: Jagtap JD and Suryawanshi NS
Number of views: 384
Onion (Allium cepa L.) is an important vegetable crop in India and as well in Maharashtra. There are various pathogens attacking on onion and basal rot caused by Fusarium oxysporum f. sp. cepae. Schlecht. Emend. Snyder & Hansen is dominant in Nasik district. The disease management is equally important using biocontrol agents to increase productivity of this crop. Therefore, evaluated the ability of biocontrol agents viz. Aspergillus niger, A. flavus, Trichoderma viride, T. harzianum, T. koningii, Curvularia lunata, Penicillium expansum, Alternaria alternata, Xanthomonos axonopodis, Bacillus subtilis, and Pseudomonas fluorescens against Fusarium oxysporum. All these biocontrol agents observed significantly reduction in the growth of the pathogens. Trichoderma viride was more fruitful PCE value (78.88) against Fusarium oxysporum followed by A. niger, T. harzianum, A. flavus, T. koningii, Curvularia lunata, Alternaria alternata, Penicillium expansum, Xanthomonas axonopodis, Bacillus subtilis and Pseudomonas fluorescens (12.85) by dual culture technique in vitro. In the nature microbial interactions involve competition, hyper parasitism and these phenomena play vital role in striking ecological balance and keeping several plant pathogens in check. In recent times biological control of plant pathogenic fungi has received a considerable attention, as it has several advantages such as possibility of multiple pathogen suppression, low cost and promotion of soil fertility.