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Control of experimental Triatoma infestans populations: effect of pour‐on cypermethrin applied to chickens under natural conditions in the Argentinean Chaco region
Author(s) -
AMELOTTI I.,
CATALÁ S. S.,
GORLA D. E.
Publication year - 2014
Publication title -
medical and veterinary entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 82
eISSN - 1365-2915
pISSN - 0269-283X
DOI - 10.1111/mve.12034
Subject(s) - triatoma infestans , reduviidae , nymph , biology , cypermethrin , moulting , instar , context (archaeology) , population , veterinary medicine , hemiptera , ecology , toxicology , zoology , trypanosoma cruzi , pesticide , larva , parasite hosting , paleontology , demography , medicine , sociology , world wide web , computer science
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 45 days 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 .