Vol. 7, Issue 12, Part I (2025)

This study was aimed to determine the nematicidal efficacy of marigold (Tagetes erecta) against root-knot nematode, Meloidogyne incognita which are most destructive nematode pest infecting almost all crops. In this study, aqueous extract of different parts of marigold viz., leaf, flower and root were tested at different concentration (10%, 20% and 30%). Each treatment was tested with three replications and the experiments were designed with the completely randomized block design. Results showed that highest inhibition of nematode egg hatching was recorded in 30 per cent concentration of marigold roots extracts (88.0 per cent) followed by 20 per cent of roots extracts (59.7) within 48 hr. Highest juvenile mortality was recorded in 30 per cent concentration of marigold roots extracts (88.7 per cent) followed by 20 per cent of roots extracts (86.7) on 7^th day. On the other hand, no juvenile mortality was observed upto 4 days in untreated control. It can be concluded from the results using marigold may significantly reduce the damages caused by the root-knot nematodes.