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The main component of the scent of Senecio madagascariensis flowers is an attractant for Aedes aegypti (L.) (Diptera: Culicidae) mosquitoes

Published online by Cambridge University Press:  06 July 2022

G. A. Kashiwagi*
Affiliation:
Centro de Investigaciones de Plagas e Insecticidas (CONICET-CITEDEF), Juan Bautista de La Salle 4397, B1603ALO Villa Martelli, Provincia de Buenos Aires, Argentina
S. von Oppen
Affiliation:
Centro de Investigaciones de Plagas e Insecticidas (CONICET-CITEDEF), Juan Bautista de La Salle 4397, B1603ALO Villa Martelli, Provincia de Buenos Aires, Argentina
L. Harburguer
Affiliation:
Centro de Investigaciones de Plagas e Insecticidas (CONICET-CITEDEF), Juan Bautista de La Salle 4397, B1603ALO Villa Martelli, Provincia de Buenos Aires, Argentina
P. González-Audino
Affiliation:
Centro de Investigaciones de Plagas e Insecticidas (CONICET-CITEDEF), Juan Bautista de La Salle 4397, B1603ALO Villa Martelli, Provincia de Buenos Aires, Argentina
*
Author for correspondence: G. A. Kashiwagi, Email: gustavokashiwagi@gmail.com

Abstract

Aedes aegypti (L.) (Diptera: Culicidae) is one of the main vectors of arboviruses, including dengue, Zika, and chikungunya. It almost exclusively inhabits urban areas. Both sexes feed on plant carbohydrates, although for males, this is their only food source. In the case of floral nectars, mosquitoes locate plant sugar sources assisted by volatile compounds. In this work, we found that the floral scent of Senecio madagascariensis elicited a behavioral response in males; therefore, we focused on identifying the volatiles emitted by these flowers. The terpenes (±)-α-pinene, β-pinene, sabinene, and phellandrene and 1-alkenes 1-undecene, and 1-nonene were identified. To determine which compounds are bioactive, pure synthetic lures were assessed using an olfactometer. Only the main compound 1-nonene was an attractant for males. Since our goal was the introduction of synthetic floral-based attractants in toxic sugar-baited traps, we formulated 1-nonene in solid paraffin and stearin matrices to obtain a controlled release system. The bioassay with a toxicological end point showed that the incorporation of a feeding attractant to the toxic sugar trap increased overall mortality. These results suggest that it is possible to use plant volatile compounds or flower cuttings as male Ae. aegypti attractants to improve the efficacy of baited traps.

Type
Research Paper
Copyright
Copyright © CONICET-UNIDEF, 2022. Published by Cambridge University Press.

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Footnotes

*

Both authors contributed equally.

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