Absence of Close-Range Excitorepellent Effects in Malaria Mosquitoes Exposed to Deltamethrin-Treated Bed Nets

J. Spitzen, C.A.M. Ponzio, C.J.M. Koenraadt, H.V. Pates Jamet, W. Takken

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

Flight behavior of insecticide-resistant and susceptible malaria mosquitoes approaching deltamethrin-treated nets was examined using a wind tunnel. Behavior was linked to 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
Original languageEnglish
Pages (from-to)1124-1132
JournalAmerican Journal of Tropical Medicine and Hygiene
Volume90
Issue number6
DOIs
Publication statusPublished - 2014

Keywords

  • resistant anopheles-gambiae
  • culex-quinquefasciatus mosquitos
  • experimental hut trials
  • piperonyl butoxide
  • diptera-culicidae
  • permanet(r) 3.0
  • helicoverpa-armigera
  • impregnated bednets
  • exiting behavior
  • child-mortality

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