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Comparative Evaluation of Pyrethroid Insecticide Formulations against Triatoma infestans (Klug): Residual Efficacy on Four Substrates

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dc.contributor.author Rojas de Arias, Antonieta
dc.contributor.author Lehane, MJ
dc.contributor.author Schofield, CJ
dc.contributor.author Fournet, Alain
dc.date.accessioned 2017-01-07T20:53:30Z
dc.date.available 2017-01-07T20:53:30Z
dc.date.issued 2003
dc.identifier.issn 0074-0276 (Print)
dc.identifier.issn 0074-0276 (Print)
dc.identifier.issn 1678-8060 (Electronic)
dc.identifier.issn 0074-0276 (Linking)
dc.identifier.uri http://localhost:8080/xmlui-directorioacademico/handle/123456789/46
dc.description.abstract We investigated the residual efficacy of four insecticide formulations used in Chagas disease vector control campaigns: cyfluthrin 12.5% suspension concentrace (SC), lambda-cyhalothrin 10% wettable powder (WP), deltamethrin 2.5% SC, and 2.5% WP on four types of circular blocks of wood, straw with mud, straw with mud painted with lime, and mud containing 5% of cement. Three concentrations of these insecticides were tested: the LC90 (previously determined on filter paper), the double of the LC90, and the recommended operational dose. For each bioassay test, 15 third-stage nymphs of Triatoma infestans (Klug) (Hemiptera: Reduviidae) were exposed for 120 h to each treatment at 24 h, 30, 60, 90, and 180 days post-spraying. Mortality rates, moulting history and behaviour were recorded at 24, 48, 72, and 120 h of exposure. Mortality rates were highest during the first 30 days post-spraying. Highest mortality rates (above 50%) were observed for deltamethrin 2.5% SC and lambda-cyhalothrin 10% WP on wood blocks up to three months post-spraying. Mud was the substrate on which treatments showed lowest persistence, with the other two substrates showing intermediate residual efficacy of all treatments. During the first 30 days WP formulations were not as effective as SC flowable formulations but, overall in the longer term, WP gave grater mortality rates of T. infestans nymphs exposed at up to six months post-spraying. Porous surfaces, especially mud, showed most variability presumably due to absorption of the insecticide. In contrast the less porous surfaces (i.e. wood and lime-coated mud) kept mortality rates high for longer post-treatment, irrespective of the insecticide concentration used.
dc.format application/pdf
dc.publisher Rio de Janeiro : Instituto Oswaldo Cruz
dc.source Memórias do Instituto Oswaldo Cruz
dc.subject bioassays
dc.subject efficacy
dc.subject insecticides
dc.subject pyrethroid
dc.subject residuality
dc.subject substrates
dc.subject Triatoma infestans
dc.subject.mesh Parasitic Diseases
dc.subject.mesh Parasitology
dc.subject.mesh Research
dc.title Comparative Evaluation of Pyrethroid Insecticide Formulations against Triatoma infestans (Klug): Residual Efficacy on Four Substrates
dc.type Artículo
dcterms.bibliographicCitation Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 98(7): 975-980, October 2003
dc.source.volume 98
dc.source.volume 7
dc.source.pages 975 - 980
dc.contributor.identifier 1261551
dc.directorio.index Index medicus: v62n1, 1964-
dc.directorio.index MEDLINE: v62n1, 1964-
dc.directorio.index PubMed: v62n1, 1964-
dc.directorio.index OLDMEDLINE
dc.directorio.index PMC

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