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Nematicidal Activity of Monoterpenoids Against the Root-Knot Nematode Meloidogyne incognita

February 2010 , Volume 100 , Number  2
Pages  199 - 203

Sergio Echeverrigaray, Jucimar Zacaria, and Ricardo BeltrÃo

Institute of Biotechnology, University of Caxias do Sul, Caxias do Sul 95070-560, RS, Brazil.

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Accepted for publication 15 October 2009.

Nematicidal activity of 22 monoterpenoids were evaluated in vitro and in pot experiments. Twenty of the twenty-two monoterpenoids significantly reduced hatching, and 11 reduced J2 mobility of the root-knot nematode Meloidogyne incognita at a concentration of 250 mg/liter. In general, compounds with hydroxyl and carbonyl groups exhibited higher nematicidal activity than other terpenoids. Borneol, carveol, citral, geraniol, and α-terpineol showed the highest nematicidal activity among the in vitro tested monoterpenoids. These compounds exhibited a dose dependent effect, and drastically reduced eggs hatching and J2 viability at low concentrations. These monoterpenoids, at 100 and 250 mg/kg concentration, diminished root galling of tomato plants in pot experiments. The results suggest that the selected monoterpenoids, and essential oils with high concentration of these compounds, are potential nematicides against Meloidogyne.

© 2010 The American Phytopathological Society