Nematicidal activity of monoterpenoids against the root-knot nematode Meloidogyne incognita.
ABSTRACT 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 alpha-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.
Echeverrigaray
Sergio
S
Institute of Biotechnology, University of Caxias do Sul, Caxias do Sul 95070-560, RS, Brazil. selaguna@ucs.br
Zacaria
Jucimar
J
Beltrão
Ricardo
R
D000818:Animals; D000969:Antinematodal Agents / Q000494:pharmacology*; D039821:Monoterpenes / Q000494:pharmacology*; D014431:Tylenchoidea / Q000187:drug effects*
D000969:Antinematodal Agents; D039821:Monoterpenes