Effects of cypermethrin pour on applied on chicken over Triatoma infestans, under laboratory conditions

AMELOTTI I; CATALÁ SS; GORLA DE

MEMóRIAS DO INSTITUTO OSWALDO CRUZ.

FUNDACO OSWALDO CRUZ

Año: 2009 vol. 104 p. 481 - 485

0074-0276

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-fareast-language:ES;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> This article reports the effects of a pour-on formulation of cypermethrin (6% active ingredient) applied to chickens used to feed Triatoma infestans, the main vector of Chagas disease in rural houses of the Gran Chaco region of South America. This study was designed as a completely random experiment with 3 experimental groups and 5 replicates per group. Third instar nymphs were fed on chickens treated with 0, 1 or 2cc of the formulation. Nymphs were allowed to feed on the chickens at different time intervals after the insecticide application. Third-instar nymphs fed on treated chickens showed higher mortality, took less blood during feeding and had lower moulting rate. The mortality rate was highest 7 days after the insecticide application and blood intake was affected until 30 days after the application of the insecticide.