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Differential Behavioral Responses of Anopheles gambiae (Diptera: Culicidae) Modulate Mortality Caused by Pyrethroid-Treated Bednets

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Direct observations of individual Anopheles gambiae s.s. (Diptera: Culicidae) females fleetingly but repeatedly alighting on pyrethroid-treated fabric of long-lasting insecticide treated nets (LLINs) fitted over a human hand proved that onset of behavioral effects modulated mortality. For Olyset Net, containing 1,000 mg of permethrin per m2, mosquitoes reduced landing attempts and elevated frequency of flight within 3 min. This kinetic disengagement resulted in little mortality. In contrast, mosquito landing attempts on PermaNet (containing 55 mg of deltamethrin per m2) were sustained for up to 6 min before disengagement, and mortality was a frequent outcome. The likely disengagement mechanism was loss of response to host cues, which was restored within 24 h. We conclude that optimal LLIN formulations should maximize engagement so as to maximize mortality.

Keywords: direct behavioral observations; long-lasting insecticide treated nets; loss of host cues; malaria vector

Document Type: Research Article

Publication date: December 1, 2009

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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