Aedes aegypti check for this species in other resources - Derris urucu check for this species in other resources - plant extract - insecticide"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. 2, 2002, pp. 371-375
Bioline Code: oc02071
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 2, 2002, pp. 371-375

 en Derris (Lonchocarpus) urucu check for this species in other resources (Leguminosae) Extract Modifies the Peritrophic Matrix Structure of Aedes aegypti check for this species in other resources (Diptera:Culicidae)
Desiely Silva Gusmão; Valéria Páscoa; Leda Mathias; Ivo José Curcino Vieira; Raimundo Braz-Filho & Francisco José Alves Lemos

Abstract

Aqueous suspension of ethanol extracts of Derris (Lonchocarpus) urucu check for this species in other resources (Leguminosae), collected in the state of Amazonas, Brazil, were tested for larvicidal activity against the mosquito Aedes aegypti (Diptera:Culicidae). The aim of this study was to observe the alterations of peritrophic matrix in Ae. aegypti larvae treated with an aqueous suspension of D. urucu extract. Different concentrations of D. urucu root extract were tested against fourth instar larvae. One hundred percent mortality was observed at 150 μg/ml (LC50 17.6 μg/ml) 24 h following treatment. In response to D. urucu feeding, larvae excreted a large amount of amorphous feces, while control larvae did not produce feces during the assay period. Ultrastructural studies showed that larvae fed with 150 μg/ml of D. urucu extract for 4 h have an imperfect peritrophic matrix and extensive damage of the midgut epithelium. Data indicate a protective role for the peritrophic matrix. The structural modification of the peritrophic matrix is intrinsically associated with larval mortality.

Keywords
peritrophic matrix - larvicide - Aedes aegypti check for this species in other resources - Derris urucu check for this species in other resources - plant extract - insecticide

 
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