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Title: Laboratory evaluation of aromatic essential oils from thirteen plant species as candidate repellents against Leptotrombidium chiggers (Acari: Trombiculidae), the vector of scrub typhus
Authors: Praphathip Eamsobhana
Adisak Yoolek
Wittaya Kongkaew
Kriangkrai Lerdthusnee
Nittaya Khlaimanee
Anchana Parsartvit
Nat Malainual
Hoi Sen Yong
Mahidol University
Armed Forces Research Institute of Medical Sciences, Thailand
Thailand Ministry of Public Health
University of Malaya
Keywords: Agricultural and Biological Sciences;Environmental Science
Issue Date: 1-Mar-2009
Citation: Experimental and Applied Acarology. Vol.47, No.3 (2009), 257-262
Abstract: Scrub typhus, a rickettsial disease transmitted by several species of Leptotrombidium chiggers (larvae), is endemic in many areas of Asia. The disease is best prevented by the use of personal protective measures, including repellents. In this study commercially produced aromatic, essential oils of 13 plant species and ethanol (control) were tested in the laboratory for repellency against host-seeking chiggers of Leptotrombidium imphalum Vercammen-Grandjean and Langston (Acari: Trombiculidae). A rapid, simple and economic in vitro test method was used by exposing the chigger for up to 5 min. Repellency was based on relative percentages of chiggers attracted to test and control substances. Four of the 13 essential oils showed promise as effective repellent against L. imphalum chiggers. Syzygium aromaticum (clove) oil exhibited 100% repellency at 5% concentration (dilution with absolute ethanol), whereas Melaleuca alternifolia (tea tree) oil exhibited 100% repellency at 40% concentration. Undiluted oils of Zingiber cassamunar (plai) and Eucalyptus globules (blue gum) exhibited 100% repellency. Of the remaining nine essential oils, only 100% Pelargonium graveolens (geranium) exhibited >50% repellency (viz. 57%). Styrax torkinensis (benzoin) oil did not exhibit any repellency. These findings show that several aromatic, essential oils of plants may be useful as chigger repellent for the prevention of scrub typhus. Syzygium aromaticum oil may be safer and more economical to prevent chigger attacks than commercially available synthetic chemicals, such as DEET that may have harmful side effects. © 2008 Springer Science+Business Media B.V.
ISSN: 15729702
Appears in Collections:Scopus 2006-2010

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