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International Journal of Zoology and Applied Biosciences Research Article

In vitro evaluation of different strains of Bacillus spp. against root-knot nematode, Meloidogyne incognita

Ritu Yadav, Vinod Kumar, Sardul Singh Mann, Aman Sahoo, Rakesh Kumar

Year : 2026 | Volume: 11 | Issue: 1 | Pages: 248-253

doi: https://doi.org/10.55126/ijzab.2026.v11.i01.032

Received on: 03/10/2025

Revised on: 22/11/2025

Accepted on: 24/12/2025

Published on: 31/01/2026

  • Ritu Yadav, Vinod Kumar, Sardul Singh Mann, Aman Sahoo, Rakesh Kumar( 2026).

    In vitro evaluation of different strains of Bacillus spp. against root-knot nematode, Meloidogyne incognita

    . International Journal of Zoology and Applied Biosciences, 11( 1), 248-253.

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Abstract

Rhizospheric bacteria, Bacillus species are widely evaluated as a biological control agent against root-knot nematode (Meloidogyne incognita), causing infection in various crops. There are various strains that were found to be effective against root-knot nematode. The culture filtrate of these bacterial strains contains secondary metabolites that showed certain nematicidal properties. An in vitro experiment was conducted to evaluate the inhibitory properties of a few bacterial culture filtrates on egg hatching of M. incognita. The inhibitory effect varied according to rhizobacterial strains, different concentration levels and exposure time. After 24h of incubation, very little egg hatching was recorded at all the concentrations. Reducing the concentration of CFs showed a positive effect on egg hatching in case of all the rhizobacterial strains. Among the five rhizobacterial strains, the maximum hatching inhibition was observed in the case of Bacillus aryabhatti (KMT 4), which was around 19.9%, followed by Gluconactetobacter diazotropicus, having 22.1% hatching at S/2 concentration. All other rhizobacterial strains significantly reduced egg hatching at all the concentrations as compared to the untreated check (67.5%). The minimum hatching was observed at a higher concentration of S/2 and it gradually increased with an increase in the dilutions, irrespective of the exposure period.

Keywords

Rhizospheric bacteria, Meloidogyne incognita, Bacillus aryabhatti, Gluconactetobacter diazotropicus.

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    © The Author(s) 2025. This article is published by International Journal of Zoology and Applied Biosciences under the terms of the Creative Commons Attribution 4.0 International License (creativecommons.org), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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