Control of root-knot nematode Meloidogyne Incognita by Nimin (Triterpenes) on green gram Vigna Radiata (L.)
Jeevalatha A, Umamaheswari R, Krishnamoorthy S
Studies on pathogenicity of Meloidogyne incognita on the pathophysiology of green gram, Vigna radiata (L.) were carried out in relation to different concentration of Nimin with reference to growth parameters, root-knot development, nematode population build-up, host plant metabolites such as protein and carbohydrate, inhibition of egg hatchability and larval mortality of M. incognita. All the concentration of Nimin resulted in reduced infection in the host plant there by increasing the length and weight of root and shoot. Among the different concentration of Nimin the significant increase in plant growth was found at 2g/kg level. However at higher rate (4g/kg level) the plant growth reduced due to the phytotoxicity of Nimin. Higher treatment shows reducing the gall formation and improved growth in host plant. In treated plants shows the highest values of protein and carbohydrates. A negative correlation found between concentrations of Nimin and M. incognita egg hatchability and 80 ppm concentration of Nimin shows maximum inhibitory action in egg hatchability. The 10 ppm concentration of Nimin shows cent percent larval mortality of M. incognita after 24 hours exposure. From the present investigation it can be concluded that soil application of Nimin 2 kg/ ha is adequate to protect the sunflower plants from the potential damage caused by root-knot nematode.
Jeevalatha A, Umamaheswari R, Krishnamoorthy S. Control of root-knot nematode Meloidogyne Incognita by Nimin (Triterpenes) on green gram Vigna Radiata (L.). International Journal of Entomology Research, Volume 6, Issue 3, 2021, Pages 170-173