Abstract
Abstract Control of plant-parasitic nematodes essentially involves use of synthetic nematicides. However, apart from cost, increased concern for the environment has necessitated a reduction in the amount of nematicides used for control. Additionally, there has been an increase in the search for other efficient; ecologically sound and safe control methods. Eggs of root-knot nematode, Meloidogyne incognita (Kofoid & White) Chitwood, were exposed to concentrations of root extracts of Siam weed [Chromolaena odorata (L.) King and Robinson], Neem (Azadirachta indica A. Jass), Castor bean (Ricinus communis L.) and Lemon grass (Cymbopogon citratus L.). Undiluted (100%) concentrations of root extracts of Siam weed and Neem exhibited 100% inhibition of egg hatch and larval mortality, while the 100% concentration of root extracts of Castor bean and Lemon grass exhibited 93 and 95% inhibition of egg hatch and 62 and 75% larval mortality, respectively. Egg hatch inhibition and larval mortality decreased as extracts we...
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