Amelotti I.,Centro Regional Of Investigaciones Cientificas Y Transferencia Tecnologica Of La Rioja Crilar |
Catala S.S.,Centro Regional Of Investigaciones Cientificas Y Transferencia Tecnologica Of La Rioja Crilar |
Gorla D.E.,Centro Regional Of Investigaciones Cientificas Y Transferencia Tecnologica Of La Rioja Crilar
Medical and Veterinary Entomology | Year: 2014
Among peridomestic structures, chicken coops are sites of major importance for the domestic ecology of Triatoma infestans (Hemiptera: Reduviidae). The aim of this study was to evaluate in an experimental context the effects of a cypermethrin pour-on formulation applied to chickens on blood intake, moulting and mortality in T. infestans, under the natural climatic conditions of a region endemic for Chagas' disease. Experimental chicken huts were made of bricks and covered with plastic mosquito nets. Ninety fourth-instar nymphs were maintained in each hut. The study used a completely random design in which chickens in the experimental group were treated with a cypermethrin pour-on formulation. Five replicates (=huts) of the experimental and control groups were conducted. The number of live T. infestans, blood intake and moults to fifth-instar stage were recorded at 1, 5, 20, 35 and 45days after the application of cypermethrin. Cumulative mortality was higher in nymphs exposed to treated chickens (>71%) than in control nymphs (<50%) (P<0.01). Blood intake and moulting rate were lower in nymphs fed on treated chickens than in control nymphs (P<0.05). Pour-on cypermethrin was able to cause significant mortality, although it did not eliminate the experimental population of T. infestans. © 2013 The Royal Entomological Society.