Effect of medicinal plant extracts on inoculated Meloidogyne javanica in tomato

In this study, the inhibitory effect of medicinal plant extracts viz., marigold (Tagetes spp.), rosemary (Rosmarinus officinalis L.) and nigella (Nigella sativa L.) on root-knot nematode, Meloidogyne javanica @ 1500, 2500 and 5000 juveniles were studied on susceptible tomato cv. Karoon under greenhouse condition. Although all the treatments reduced root infections rate and significantly effect on root weight (P ≤ 0.05). It was observed that when the nematode inoculum increased, reproduction factor also increased while extract treatments effect decreased. In between treatments, rosemary extract has the greatest impact on the reduction of nematode populations @ 40% concentration as compared to control.