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1 November 2010 The Effects of Cypermethrin Pour-On and Piperonyl Butoxide on Triatoma infestans Under Laboratory Conditions
Ivana Amelotti, Silvia S. Catalá, David E. Gorla
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Abstract

The effect of exposing Triatoma infestans to chickens treated with Cypermethrin pour-on combined with piperonyl butoxide (PBO) was studied. Four groups of treated chickens and one control group were used. Each treatment received 1 or 2 ml of the Cypermethrin formulation with and without PBO. Independent groups of nymphs were fed 1, 7, 15, 30, and 45 d after the treatment application. Blood intake was estimated after each feeding occasion. Up to 15 d after the pour-on application, high mortality was observed in all nymphs fed on treated chickens (>93%±12), and lower than the nymphs of the control group (<33%±15). After 30 d of the pour-on application, there was significantly different mortality between the treatment with 1 ml (80%±9) and 2 ml (>96%±5); no difference was observed between groups with or without PBO addition. After 45 d of the pour-on application, the treatments did not show significant differences (77%±7), although all treatments showed higher mortality than the control group (10%±9). Up to 45 d after the pour-on application, blood intake by nymphs exposed to treated chickens (0.85±0.96 mg/nymph) was lower than blood intake by nymphs exposed to control chickens (6.7±5 mg/nymph). This study shows that Cypermethrin pour-on produces high mortality and reduces the blood intake of third-instar nymphs of T. infestans up to 45 d after the insecticide application to chickens. PBO did not produce a detectable effect.

© 2010 Entomological Society of America
Ivana Amelotti, Silvia S. Catalá, and David E. Gorla "The Effects of Cypermethrin Pour-On and Piperonyl Butoxide on Triatoma infestans Under Laboratory Conditions," Journal of Medical Entomology 47(6), 1135-1140, (1 November 2010). https://doi.org/10.1603/ME10116
Received: 30 April 2010; Accepted: 1 September 2010; Published: 1 November 2010
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