title: Comparative Behavioral Responses of Pyrethroid-Susceptible and -Resistant Aedes aegypti (Diptera: Culicidae) Populations to Citronella and Eucalyptus Oils.
abstract: The objective of this study was to compare the behavioral responses (contact irritancy and noncontact spatial repellency) between susceptible and resistant populations of Aedes aegypti (L.) (=Stegomyia aegypti) to essential oils, citronella, and eucalyptus, Eucalyptus globulus, extracts, using an excito-repellency test system. N, N-diethyl-meta-toluamide (DEET) was used as the standard reference repellent. Mosquitoes included two long-standing insecticide susceptible colonies (U.S. Department of Agriculture and Bora Bora) and two pyrethroid-resistant populations recently obtained from Phetchabun and Kanchanaburi provinces in Thailand. Both DEET and citronella produced a much stronger excitation ("irritancy") and more rapid flight escape response in both pyrethroid-resistant populations compared with the laboratory populations. Noncontact repellency was also greater in the two resistant populations. Eucalyptus oil was found to be the least effective compound tested. Differences in responses between long-established pyrethroid-susceptible colonies and newly established and naturally resistant colonies were clearly demonstrated. These findings also demonstrate the need for further comparisons using natural pyrethroid-susceptible populations for elucidation of factors that might contribute to different patterns of escape behavior.
authors: Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand.
authors: Sunaiyana
authors: S
authors: Sathantriphop
authors: Bureau of Vector-Borne Disease, Department of Disease Control, Ministry of Public Health, Nonthaburi 11000, Thailand.
authors: Kanutcharee
authors: K
authors: Thanispong
authors: Institute of Research and Development, Rajamangala University of Technology Thanyaburi, Patumthani 12110, Thailand.
authors: Unchalee
authors: U
authors: Sanguanpong
authors: Eck Institute for Global Health, Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556.
authors: Nicole L
authors: NL
authors: Achee
authors: Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand. Public Health & Malaria Control Department, International SOS, Kuala Kencana, Papua, Indonesia.
authors: Michael J
authors: MJ
authors: Bangs
authors: Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand. faasthc@ku.ac.th.
authors: Theeraphap
authors: T
authors: Chareonviriyaphap
mesh_terms: D000330:Aedes; D000818:Animals; D005052:Eucalyptus; D005260:Female; D007305:Insecticide Resistance; D007306:Insecticides; D010938:Plant Oils; D011722:Pyrethrins
chemical_list: D007306:Insecticides; D010938:Plant Oils; D011722:Pyrethrins; C076730:citronella oil
keywords: Aedes aegypti; DEET; behavior; citronella oil; eucalyptus oil