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Am. J. Trop. Med. Hyg., 73(2), 2005, pp. 343-349
Copyright © 2005 by The American Society of Tropical Medicine and Hygiene

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BEHAVIORAL RESPONSES TO DDT AND PYRETHROIDS BETWEEN ANOPHELES MINIMUS SPECIES A AND C, MALARIA VECTORS IN THAILAND

JINNAPA POTIKASIKORN, THEERAPHAP CHAREONVIRIYAPHAP*, MICHAEL J. BANGS, AND ATCHARIYA PRABARIPAI
Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok, Thailand; United States Naval Medical Research Center, Silver Spring, Maryland; Division of Computer and Biostatistics, Faculty of Liberal Arts and Sciences, Kasetsart University, Nakhonpathom, Thailand

Behavioral responses of two field populations of Anopheles minimus complex species A and C for contact and non-contact actions of chemicals were compared during and after exposure to operational field concentrations of DDT (2 g/m2), deltamethrin (0.02 g/m2), and lambdacyhalothrin (0.03 g/m2) using an excito-repellency escape chamber. The two populations were collected from the Mae Sot District in Tak Province (species A) and the Tri Yok District in Kanchanaburi Province (species C) in western Thailand. Female mosquitoes of both populations rapidly escaped from chambers after direct contact with DDT, deltamethrin, and lambdacyhalothrin. The non-contact repellency response to DDT and the two synthetic pyrethroids was pronounced with An. minimus species A; however, non-contact repellency was relatively weak with An. minimus species C, but remained significantly greater than the paired controls (P < 0.05). We conclude that strong contact irritancy was present in both test populations, whereas non-contact repellency also played a significant role in the escape response of An. minimus species A.

Received January 12, 2005. Accepted for publication February 26, 2005.

Financial support: This work was supported by the Thailand Research Fund and the Kasetsart University Research and Development Institute, Thailand.

* Address correspondence to Dr. Theeraphap Chareonviriyaphap, Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand. E-mail: faasthc{at}ku.ac.th

Authors’ addresses: Jinnapa Pothikasikorn and Theeraphap Chare-onviriyaphap, Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand. Michael J. Bangs, Naval Medical Research Center, 503 Robert Grant Avenue, Room 3A40, Silver Spring, MD 20910-7500. Atchariya Parbaripai, Division of Computer and Biostatistics, Faculty of Liberal Arts and Science, Kasetsart University, Nakhonpathom 73140 Thailand.

Reprint requests: Theeraphap Chareonviriyaphap, Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand, Telephone: 66-2-942-7131, Fax: 66-2-942-7130, E-mail: faasthc{at}ku.ac.th.






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Copyright © 2005 by the American Society of Tropical Medicine and Hygiene.