EFFECTS OF JATROPHA CURCAS AND AZADIRACHTA INDICA ROOT EXTRACTS ON EGG HATCH AND LARVA MORTALITY OF MELOIDOGYNE INCOGNITA

Abstract

Chemical control of plant-parasitic nematodes, essentially involves the use of synthetic Nematicides. However, apart from their very high cost, increased concern on the environment has necessitated a reduction in the amount of Nematicides used for nematode control. In view of these, this research work was conducted to evaluate the effects of different concentrations of root extracts of Jatropha curcas and Azadirachita indica at ‘S’ (100% concentration), ‘S/2’(50% concentration), ‘S/10’(10% concentration), ‘S/100’(1% concentration) in the inhibition of egg hatch and mortality of larva of root-knot nematode, Meloidogyne incognita. The experiment was laid out in a completely randomized designed and replicated four times. All the concentrations of J. Curcas, A. Indica and their combination inhibited egg hatch of M. Incognita throughout the period of observation. The standard solution (S) of J. Curcas exhibited the highest larva mortality after 96 hours. The combination of equal proportion of A. indica and J. Curcas root extract indicated that all the concentrations inhibited egg hatch except S/100 after 96 hours of exposure. Larva mortality was found to decrease with an increase in the dilution of all the extracts.