Nematicidal activity of Haplophyllum tuberculatum and Plectranthus cylindraceus oils against Meloidogyne javanica

Anthony K. Onifade, Majekodunmi O. Fatope, Michael L. Deadman, Salma M Z Al-Kindy

Research output: Contribution to journalArticle

17 Citations (Scopus)


The potentials of Haplophyllum tuberculatum and Plectranthus cylindraceus oils to control Meloidogyne javanica were investigated in vitro and in a greenhouse. A mixture of Haplophyllum and Plectranthus oils (1:1) was highly toxic to M. javanica in vitro, as it killed all nematode juveniles and inhibited hatching of eggs at 12.5 μg/ml concentration after 24 h exposure time, as did carbofuran at the same concentration. In the green-house, tomatoes grown in soil treated with a combination (1:1) of the two oils developed fewer root galls than those grown in soil treated with higher doses of either oil. The oil mixture, at 2.5 and 5.0 μg/ml of soil, was not phytotoxic to tomato plants as evident from the appearance and height of plants after 12 weeks exposure time, compared to treatment over the same period at lower effective doses. The nematicidal activity of the combined essential oils was suggested by the presence of C10 dienes, C10 trienes and C10 phenol.

Original languageEnglish
Pages (from-to)679-683
Number of pages5
JournalBiochemical Systematics and Ecology
Issue number9
Publication statusPublished - Sep 2008



  • Essential oil
  • Haplophyllum tuberculatum
  • Plant-derived pesticide
  • Plectranthus cylindraceus
  • Root-knot nematode control

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Biochemistry

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