Journal of Entomology and Zoology Studies

Volume 2, Issue 4

Evaluation of nematicidal activity of the essential oil of Homalomena occulta (Lour.) Schott rhizome and its major constituents against Meloidogyne incognita (Kofoid and White) Chitwood

Author(s): Xin Chao Liu, Chun Qi Bai, Qi Zhi Liu, and Zhi Long Liu

Abstract: In a screening program for new agrochemicals from Chinese medicinal herbs and wild plants, essential oil of Homalomena occulta (Lour.) Schott rhizome was found to possess strong nematicidal activity against the root-knot nematodes, Meloidogyne incognita (Kofoid and White) Chitwood. The essential oil of H. occulta rhizome was extracted via hydrodistillation and investigated by gas chromatography-mass spectrometry (GC-MS). A total of 39 components of the essential oil were identified. Linalool (47.7%) was the major compound of the essential oil of H. occulta followed by 4-terpineol (16.5%) and α-terpineol (11.2%) and 87.3% of the total components were monoterpenoids. The essential oil possessed strong nematicidal activity against M. incognita with a LC50 value of 156.43 µg/ml. α-Terpineol and 4-terpineol exhibited toxicity against M. incognita with LC50 values of 103.41 µg/ml and 115.17 µg/ml, respectively while linalool had a LC50 value of 180.36 µg/ml.

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