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1 May 2013 Repellency of Cassia Bark, Eucalyptus, and Star Anise Oils and Their Major Constituents to Leptotrombidium pallidum (Acari: Trombiculidae)
E-Hyun Shin, Bong Gu Song, Hee Il Lee, Mi Yeoun Park, Young-Joon Ahn, Kyu-Sik Chang
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Abstract

Leptotrombidium pallidum (Nagoya, Miyagawa, Mitamura & Tamiya) is a primary vector of Orientia tsutsugamushi (Hyashi), the causative agent of scrub typhus. An assessment is made of the repellency to L. pallidum larvae (chiggers) of cassia bark, eucalyptus, and star anise oils and major constituents (E)-cinnamaldehyde, 1,8-cineole, and (E)-anethole of the corresponding oils. Results were compared with those of conventional repellents DEET (N,N-diethyl-3-methylbenzamide), IR3535 [(ethyl 3-[acetyl(butyl)amino]propanoate)], and permethrin. Based on the median repellent concentration (RC50) values, (E)-cinnamaldehyde, (E)-anethole, cassia bark oil, and star anise oil (RC50, 0.95–1.52 mg/cm2) exhibited significantly more potent repellency than DEET (3.85 mg/cm2). (E)-cinnamaldehyde, (E)-anethole, cassia bark oil, 1,8-cineole, and star anise oil were ≈43, 16, 11, 8, and 4 times more effective than IR3535 (CC50, 6.51%) as judged by the median climbing distance-disturbing concentration (CC50) values. The median residual duration time of repellency (RT50) was significantly more pronounced in DEET (RT50, 323 min) than in all essential oils and constituents (108–167 min). In the light of global efforts to reduce the level of highly toxic synthetic repellents, the three essential oils and their major constituents described merit further study as potential biorepellents for the control of L. pallidum populations.

© 2013 Entomological Society of America
E-Hyun Shin, Bong Gu Song, Hee Il Lee, Mi Yeoun Park, Young-Joon Ahn, and Kyu-Sik Chang "Repellency of Cassia Bark, Eucalyptus, and Star Anise Oils and Their Major Constituents to Leptotrombidium pallidum (Acari: Trombiculidae)," Journal of Medical Entomology 50(3), 579-584, (1 May 2013). https://doi.org/10.1603/ME12129
Received: 11 June 2012; Accepted: 1 November 2012; Published: 1 May 2013
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