title: Influence of nutritional and physiological status on behavioral responses of Aedes aegypti (Diptera: Culicidae) to deltamethrin and cypermethrin.
abstract: Excito-repellency responses of Aedes aegypti (L.) exposed to deltamethrin and cypermethrin were assessed using an excito-repellency test system. Contact irritancy and non-contact repellency assays compared non-bloodfed (unfed) parous (post-gravid), nulliparous, early blood-fed, late blood-fed, sugar-fed, and unmated female mosquitoes for behavioral responses based on nutritional and physiological conditions at the time of testing. Rates of escape during contact exposure with either compound were most pronounced in parous mosquitoes, followed by unmated mosquitoes, when compared to other conditional states. Significantly higher numbers of parous females also escaped from control chambers compared to other cohorts (P <0.05). Irritability of blood- and sugar-fed mosquitoes was noticeably suppressed. We conclude that nutritional and physiological conditions (including age) of mosquitoes at the time of testing can significantly influence behavioral responses (excito-repellency) to insecticides. The findings indicate that whether due to chronological age, nutrition, physiological state, or innate (circadian) activity patterns, careful consideration must be given to the selection of appropriate conditioned mosquitoes for testing.
authors.affiliation: Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand.
authors.forename: Theeraphap
authors.initials: T
authors.lastname: Chareonviriyaphap
authors.forename: Monthathip
authors.initials: M
authors.lastname: Kongmee
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Bangs
authors.forename: Sunaiyana
authors.initials: S
authors.lastname: Sathantriphop
authors.forename: Vithee
authors.initials: V
authors.lastname: Meunworn
authors.forename: Atchariya
authors.initials: A
authors.lastname: Parbaripai
authors.forename: Wannapa
authors.initials: W
authors.lastname: Suwonkerd
authors.forename: Pongthep
authors.initials: P
authors.lastname: Akratanakul
mesh_terms: D000330:Aedes; D000818:Animals; D004924:Escape Reaction; D005260:Female; D007303:Insect Vectors; D007306:Insecticides; D009032:Mosquito Control; D009570:Nitriles; D011722:Pyrethrins
chemical_list: D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; C017160:cypermethrin; C017180:decamethrin