title: Absence of close-range excitorepellent effects in malaria mosquitoes exposed to deltamethrin-treated bed nets.
abstract: Flight behavior of insecticide-resistant and susceptible malaria mosquitoes approaching deltamethrin-treated nets was examined using a wind tunnel. Behavior was linked to resulting health status (dead or alive) using comparisons between outcomes from free-flight assays and standard World Health Organization (WHO) bioassays. There was no difference in response time, latency time to reach the net, or spatial distribution in the wind tunnel between treatments. Unaffected resistant mosquitoes spent less time close to (< 30 cm) treated nets. Nettings that caused high knockdown or mortality in standard WHO assays evoked significantly less mortality in the wind tunnel; there was no excitorepellent effect in mosquitoes making contact with the nettings in free flight. This study shows a new approach to understanding mosquito behavior near insecticidal nets. The methodology links free-flight behavior to mosquito health status on exposure to nets. The results suggest that behavioral assays can provide important insights for evaluation of insecticidal effects on disease vectors.
authors.affiliation: Laboratory of Entomology, Wageningen University, Wageningen, The Netherlands; Vestergaard Frandsen SA, Lausanne, Switzerland.
authors.forename: Jeroen
authors.initials: J
authors.lastname: Spitzen
authors.affiliation: Laboratory of Entomology, Wageningen University, Wageningen, The Netherlands; Vestergaard Frandsen SA, Lausanne, Switzerland.
authors.forename: Camille
authors.initials: C
authors.lastname: Ponzio
authors.affiliation: Laboratory of Entomology, Wageningen University, Wageningen, The Netherlands; Vestergaard Frandsen SA, Lausanne, Switzerland.
authors.forename: Constantianus J M
authors.initials: CJ
authors.lastname: Koenraadt
authors.affiliation: Laboratory of Entomology, Wageningen University, Wageningen, The Netherlands; Vestergaard Frandsen SA, Lausanne, Switzerland.
authors.forename: Helen V
authors.initials: HV
authors.lastname: Pates Jamet
authors.affiliation: Laboratory of Entomology, Wageningen University, Wageningen, The Netherlands; Vestergaard Frandsen SA, Lausanne, Switzerland willem.takken@wur.nl.
authors.forename: Willem
authors.initials: W
authors.lastname: Takken
mesh_terms: D000818:Animals; D000852:Anopheles / Q000187:drug effects* / Q000469:parasitology / Q000502:physiology; D001522:Behavior, Animal; D001681:Biological Assay; D005260:Female; D006801:Humans; D007303:Insect Vectors / Q000187:drug effects* / Q000469:parasitology / Q000502:physiology; D057148:Insecticide-Treated Bednets; D007306:Insecticides / Q000494:pharmacology*; D008288:Malaria / Q000517:prevention & control / Q000635:transmission*; D009032:Mosquito Control / Q000379:methods; D009570:Nitriles / Q000494:pharmacology*; D010961:Plasmodium / Q000502:physiology; D011722:Pyrethrins / Q000494:pharmacology*; D013997:Time Factors; D014741:Video Recording; D014944:World Health Organization
chemical_list: D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; C017180:decamethrin
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