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© Jean Marc Panaud
Cyanobactérie souche "PCC 9401". Souche de la "Pasteur Culture Collection of Cyanobacteria" conservée à l'état axénique dans l'Unité des Cyanobactéries. La PCC est l'une des Collections spécialisées de l'Institut Pasteur.
Publication :

Geosmin Attracts Aedes aegypti Mosquitoes to Oviposition Sites

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in - 06 Dec 2019

Melo N, Wolff GH, Costa-da-Silva AL, Arribas R, Fernandez Triana M, Gugger M, Riffell JA, DeGennaro M, Stensmyr MC

Link to Pubmed [PMID] – 31839454

Curr Biol. 2019 Dec 6. pii: S0960-9822(19)31441-1.

SUMMARY
Geosmin is one of the most recognizable and common microbial smells on the planet. Some insects, like mosquitoes, require microbial-rich environments for their progeny, whereas for other insects such microbes may prove dangerous. In the vinegar fly Drosophila melanogaster, geosmin is decoded in a
remarkably precise fashion and induces aversion, presumably signaling the presence of harmful microbes [1]. We have here investigated the effect of geosmin on the behavior of the yellow fever mosquito
Aedes aegypti. In contrast to flies, geosmin is not aversive but mediates egg-laying site selection.
Female mosquitoes likely associate geosmin with microbes, including cyanobacteria consumed by
larvae [2], who also find geosmin—as well as geosmin-producing cyanobacteria—attractive. Using
in vivo multiphoton calcium imaging from transgenic PUb-GCaMP6s mosquitoes, we show that Ae. aegypti code geosmin in a qualitatively similar fashion to flies, i.e., through a single olfactory channel with
a high degree of sensitivity for this volatile. We further demonstrate that geosmin can be used as bait under field conditions, and finally, we show that geosmin, which is both expensive and difficult to obtain, can be substituted by beetroot peel extract, providing a cheap and viable potential mean for mosquito control and surveillance in developing countries.