Efficacy and selectivity of Sextonia rubra wood extracts and formulation in the control of Aedes aegypti strains - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2024

Efficacy and selectivity of Sextonia rubra wood extracts and formulation in the control of Aedes aegypti strains

Résumé

Sextonia rubra is an Amazonian tree known for the larvicide activity of its wood extracts against Aedes aegypti. However, the lipophilic character of this extract represents an obstacle to the development of vector management products. The purpose of this study was to assess the feasibility, efficacy and selectivity of a water-soluble formulation based on a S. rubra wood extract characterized by its content in the larvicidal compounds rubrenolide and rubrynolide. Using reference and wild strains, the larval mortality, oviposition behavior, hatching response, and fitness of the mosquitoes exposed to the extract were evaluated. Laboratory eco-and cytotoxicity bioassays were concurrently performed. The extract showed larvicide efficacy alongside with no repulsive effect on oviposition, thus supporting its interest for the treatment of breeding sites. The formulation exhibited strong acute toxicity, leading to 100% larval mortality in 2 to 4 days either in dry or rainy season at the test dose of 102 µg/ml under semioperational conditions, with a residual activity maintained during the 5 weeks of test. The formulation allowed for a noticeable gain in selectivity compared with the extract, with lower immobilization rates for D. magna and C. riparius, and no significant toxicity towards human cells lines (IC 50 > 100 µg/ml). These results highlight the potential of a S. rubra-based formulation for the management of Ae. aegypti larvae, including strains showing resistance to conventional insecticides.
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Dates et versions

hal-04454494 , version 1 (13-02-2024)
hal-04454494 , version 2 (13-02-2024)

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Paternité

Identifiants

  • HAL Id : hal-04454494 , version 2

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Emmanuelle Clervil, Jean-Bernard Duchemin, Nadine Amusant, Edmond Wozniak, Didier Azam, et al.. Efficacy and selectivity of Sextonia rubra wood extracts and formulation in the control of Aedes aegypti strains. 2024. ⟨hal-04454494v2⟩
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