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1 September 2012 Chemical Composition and Repellency of Essential Oils from Four Medicinal Plants Against Ixodes ricinus Nymphs (Acari: Ixodidae)
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Abstract

In our search for effective tick repellents from plant origin, we investigated the effect of essential oils of four medicinal and culinary plants belonging to the family Lamiaceae on nymphs of the tick Ixodesricinus (L.). The essential oils of the dry leaves of Rosmarinus officinalis (Rosemary) (L.), Mentha spicata (Spearmint) (L.), Origanum majorana (Majoram) (L.), and Ocimum basilicum (Basil) (L.) were isolated by steam distillation and 15 µg/cm2 concentration of oils was tested against ticks in a laboratory bioassay. The oils of R. officinalis, M. spicata, and O. majorana showed strong repellency against the ticks 100, 93.2, and 84.3%, respectively, whereas O. basilicum only showed 64.5% repellency. When tested in the field, the oils of R. officinalis and M. spicata showed 68.3 and 59.4% repellency at a concentration of 6.5 µg/cm2 on the test cloths. The oils were analyzed by gas chromatography mass spectrometry and the major compounds from the most repellent oils were 1,8-cineole, camphor, linalool, 4-terpineol, borneol, and carvone.

© 2012 Entomological Society of America
Hesham R. El-Seedi, Nasr S. Khalil, Muhammad Azeem, Eman A. Taher, Ulf Göransson, Katinka Pålsson, and Anna-Karin Borg-Karlson "Chemical Composition and Repellency of Essential Oils from Four Medicinal Plants Against Ixodes ricinus Nymphs (Acari: Ixodidae)," Journal of Medical Entomology 49(5), 1067-1075, (1 September 2012). https://doi.org/10.1603/ME11250
Received: 13 November 2011; Accepted: 1 June 2012; Published: 1 September 2012
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