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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060 EISSN: 1678-8060
Vol. 97, No. 4, 2002, pp. 535-539
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Bioline Code: oc02102
Full paper language: English
Document type: Research Article
Document available free of charge
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Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 4, 2002, pp. 535-539
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Fipronil Insecticide: Novel Application against Triatomine Insect Vectors of Chagas Disease
Antonieta Rojas de Arias & Alain Fournet
Abstract
We investigated the efficacy and the residual effect of fipronil®
against two species of triatomine bugs, Triatoma infestans and Rhodnius
neglectus, in laboratory conditions measuring concentration-response and
residual activity on different surfaces (dried mud and lime coated mud).
Lethal concentrations (LC50,90) were determined on filter paper. The higher
insecticide efficacy against R. neglectus when compared to T. infestans
may be partially attributed to the differences in their biological cycles
and genetic structures. Comparison with lambdacyhalothrin wettable powder
showed that fipronil mortality rates (above 50%) were observed on mud blocks
and lime-coated mud blocks up to 3 months when fipronil was sprayed at 100
and 200 mg a.i./m
2
. Residual effect deeply decayed after 3 months; and at 6 months post treatment
mortality was not observed. In contrast, lambdacyhalothrin showed a long
lasting residual effect on both surfaces up to 6 months. Also, it should
be mentioned that fipronil had a slow, but lethal activity on the triatomine
bugs when wettable formulations were used on porous surfaces.
Keywords
fipronil - Triatoma infestans - Rhodnius neglectus - efficacy - residual effect - insecticide/surface interaction
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