Nematicidal Efficacy
of Carissa carandas Extracts against Meloidogyne incognita
Basavaraj V., Sharada M.S., Sampathkumar M.R. and Mahesh H.M.
Res. J. Biotech.; Vol. 20(7); 69-73;
doi: https://doi.org/10.25303/207rjbt069073; (2025)
Abstract
Plant-parasitic nematodes (PPNs), especially root-knot nematodes (RKNs) of the genus
Meloidogyne, significantly diminish the productivity of horticultural crops, leading
to global yield losses valued at approximately $157 billion. Traditional chemical
treatments for PPNs pose environmental hazards, prompting the need for eco-friendly
alternatives. This study explores the nematicidal potential of Carissa carandas
L. (Karonda) plant extracts against Meloidogyne incognita. Various parts of C. carandas
were collected, processed and extracted using solvents such as methanol, ethanol,
ethyl acetate, chloroform and water. The efficacy of these extracts was tested on
egg-hatching inhibition and juvenile mortality of M. incognita. Methanol extracts,
particularly from seeds, demonstrated the highest nematicidal activity, with significant
juvenile mortality and egg-hatching inhibition of M. incognita.
Results indicated that the nematicidal properties are likely due to phytochemicals
such as alkaloids, flavonoids and organic acids present in the extracts. This study
suggests that C. carandas extracts, especially methanolic seed extracts, are promising
eco-friendly alternatives for managing RKNs and promoting sustainable agricultural
practices. Further research is recommended to isolate and to identify the active
compounds responsible for the nematicidal activity.
