Inhibition and Nematicidal Effect of Plant Extracts on Meloidogyne incognita

Plant crude extracts of Ricinus communis,Solidago canadensis,Sapium sebiferum,Plumeria rubra,Lantana camara,Nicotiana alata et al were evaluated for their nematicidal effect against Meloidogyne incognita infecting tomato.The in vitriol experiment result showed that crude extracts of Lantana camara,Nicotiana alata,Solidago canadensis,Llex latifolia possessed strong nematicidal activity,the mortality rates of these plant crude extracts were higher than 95% of J2 of Meloidogyne incognita in 24 h(the concentration of these plant crude extracts are 1% ),and the mortality rates of Solidago Canadensis and Llex latifolia are 100%((the concentration of these plant crude extracts are 1%).The result also showed that nematicidal activity of different parts of plants against J2 make differences,the stem′s nematicidal activity is more effective than leaf′s of Lantana camara,the mortality rates of crude extracts of Melia azedarach′s fruits and leaves are higher than crude extract of bark.And the pot experiment result showed that Nerium indicum,Lantana camara,Melia azedarach,Llex latifolia can reduce the quantity of root-knots and egg capsules,among these plant crude extracts Llex latifolia is more effective.