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1 November 2004 Behavioral Responses of Aedes aegypti (Diptera: Culicidae) Exposed to Deltamethrin and Possible Implications for Disease Control
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Behavioral responses of nine Aedes aegypti (L.) strains, six from recent field collections and three from the long-established laboratory colonies, were tested under laboratory-controlled conditions by using an excito-repellency test system. All nine strains showed significant behavioral escape responses when exposed to deltamethrin at the standard field dose (0.02 g/m2), regardless of background insecticide susceptibility status (susceptible or tolerant/resistant). Insecticide contact irritancy played a predominate role in overall female mosquito escape responses, whereas noncontact repellency was not observed at levels significantly different from paired noncontact control tests (P > 0.01). Among the six field populations, the Jakarta (Indonesia) Toba (north Sumatra), and Bangkok female mosquitoes showed rapid exit (>78%) during 30 min of direct contact with insecticide-treated surfaces, whereas the other three strains demonstrated only moderate escape responses (32–56%) from the chambers. Moderate escape responses during direct insecticidal contact also were observed in the three laboratory test populations (44–60%). Higher percentage of mortality was observed from laboratory strains (8–33%) that failed to escape compared with nonescape females of field strains (2–16%), possibly a reflection of background deltamethrin susceptibility status. We conclude that contact irritancy is a major behavioral response of Ae. aegypti when exposed directly to deltamethrin and that rapid flight escape from areas exposed to space sprays or surfaces treated with residual pyrethroids could have a significant impact on the effectiveness of adult mosquito control and disease transmission reduction measures.

Monthathip Kongmee, Atchariya Prabaripai, Pongthep Akratanakul, Michael J. Bangs, and Theeraphap Chareonviriyaphap "Behavioral Responses of Aedes aegypti (Diptera: Culicidae) Exposed to Deltamethrin and Possible Implications for Disease Control," Journal of Medical Entomology 41(6), 1055-1063, (1 November 2004).
Received: 23 March 2004; Accepted: 1 September 2004; Published: 1 November 2004

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