Effect of medicinal plant extracts on inoculated Meloidogyne javanica in tomato

Abstract

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.

NEMATOCIDAL PROPERTIES OF RED SILK COTTON (Bombax costatum Pellegr. & Vuil.) FLOWER AGAINST ROOT-KNOT NEMATODE, (Meloidogyne javanica (Treub. 1885) CHITWOOD 1949

“…Chemicals such as carbofuran and methyl bromide have been used to control RKN (Fatoki, 2001;Adegbite, 2003;Orisajo and Dongo, 2007;Orisajo et al, 2008) but their extreme level of toxicity to man, plants and environmental pollution has precluded them from such use. Attention then turned to the use of plants in the form of powders, extracts and compost to control RKN and they have been found to be effective in reducing the harmful activities of nematodes on crops as well as being nontoxic to man and the environment (Coltro-Roncato et al, 2016;Bajestani et al, 2017;Bakr, 2018;Ogwulumba and Ogwulumba, 2018;Aji et al, 2019;Mamman et al, 2020;Moazezikho et al, 2020;Mamman et al, 2021). This necessitated the use of B. costatum to find out if it has the potential to curb damage to crops by M. javanica.…”