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Julien Van Caeyseele
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If eleven municipalities from Seine-et-Marne (read the box below) are considered colonized By the Tiger mosquito, the city of Fontainebleau appears this year as touched by an “episodic implantation”. The Imperial City is also ‘framed’ by two colonized cities: Milly-la-Forêt (Essonne) to the west and Champagne-sur-Seine, to the east. There proliferation of this harmful species is followed each year by the ARS (Regional Health Agency) of Ile-de-France, insofar as this species can transmit certain diseases.
Eleven municipalities of Seine-et-Marne colonized, Fontainebleau in “episodic implantation”
“The episodic establishment designates a town where the tiger mosquito has already been observed, but whose presence is not yet considered to be sustainable or active, it is said at the ARS (Regional Health Agency) of Ile-de-France. He was detected there punctually and not throughout the town. »» A status which should allow “to alert communities on the potential implantation of the mosquito and encourage vigilance and prevention measures, even if the municipality does not yet meet the conditions to be classified as colonized. »»
The eleven cities colonized by the tiger mosquito in Seine-et-Marne
Eleven municipalities are considered to be colonized by the tiger mosquito in Seine-et-Marne, at the end of the last reinforced surveillance season: Brie-Comte-Robert, Champagne-sur-Seine, Chelles, Champs-sur-Marne, Serris, Chessy, Gouvernes, Roissy-en-Brie, Pontault-Combault, Combs-la-Ville and Villeparisis.
A classification that does not surprise Jean-Philippe SIBLETthe president of the association of naturalists of the Valley of the Loter and the Massif de Fontainebleau (ANVL). “There will be any anyway everywhere in France, it is inevitable,” he predicts. It is like the Asian hornet: the proliferation of the tiger mosquito is one of the visible consequences of global warming. »»
According to him, this invasion in the department is the conjunction of meteorological phenomena: “very soft winters and very hot and humid summers … almost tropical conditions Which is of course suitable for tiger mosquitoes, ”he underlines. The President of the ANVL also advances another cause: the snacking of man on the natural environment: “We suppress buffer zones and we promote contacts with wild animals carrying disease”.
A first indigenous case in Ile-de-France in 2024
In its latest arbovirose bulletin in Ile-de-France (viral disease of an arbovirus and transmitted by the bite of arthropods including mosquitoes), public health France, evokes 584 imported cases (confirmed or probable) in Ile-de-France: 568 cases of dengue, 12 cases of chikungunya and 3 cases of zika. However, a case of Aboriginal chikungunya was detected for the first time in Ile-de-France in 2024, in Paris.
What is this proliferation of flies?
On social networks, residents of Fontainebleau and surroundings have reported – sometimes supporting video – the proliferation of small insects, since the beginning of June … They were sometimes identified as gnarlings, sometimes like male and sterile mosquitoes … A technique sometimes used in France to eradicate the proliferation of the Aedes albopictus in the most affected areas. Contacted, ARS Ile-de-France, however, indicates that it has never used this process in the region and specifies “that there is no specific moncheron surveillance which does not pose any risk of transmission of diseases such as mosquito.”
For his part, Jean-Philippe Siblet, the president of the association of naturalists of the Valley of Loing and the Fontainebleau massif indicates that it has also noted the proliferation. “It is rather good news,” he says. “We must not worry, nature regulates itself.” The specialist explains the presence of these insects by weather conditions: “A rainy winter and spring, followed by scorching temperatures … It is the paradise of insects, details Jean-Philippe Siblet. These are cyclical phenomena: sometimes flies, sometimes hannetons, sometimes ephemerals: manns or emergences of insects have always existed.”
In Seine-et-Marne, 46 cases of arboviroses were reported last year: 45 cases of dengue and a case of zika. According to the latest data dated July 9, no indigenous transmission episode has however been reported since 1is May in Île-de-France. For Jean-Philippe Siblet, “you have to prepare and learn to live with the tiger mosquito,” he warns. You cannot put insecticides everywhere: it would be dramatic for other species. »»
Three demoustication operations in Seine-et-Marne in 2024, none to date in 2025
However, the ARS specifies that no demustication operation was carried out in the department in 2025 (three operations had been carried out in 2024 in Combs-la-Ville, Savigny-le-Temple and Champs-sur-Marne). “They are not used to rid a district of the Tiger mosquito, but only in the event of a potential health threat, to reduce the risk of local transmission,” it is said to the agency. They are only decided after a report of arbovirosis and a field survey in the 150 m of the declared case.
Residents can point out the potential presence of mosquito-tiger on the ASES dedicated reporting platform (National Agency for Food Safety, Environment and Labor) by transmitting either a photo of a mosquito and a mosquito “in a state allowing its identification”. According to the ARS, 14 exploitable reports of tigers mosquitoes have been received to date, issued from Seine-et-Marne.
“Others exotic species Invasive will appear, whether animal or vegetable, concludes Jean-Philippe Siblet. Look at the America’s grapes, this invasive species arrived in the Fontainebleau forest because of seeds stuck under the shoes of American military … She found here the favorable conditions to develop: it’s the same for this mosquito. »»
Information: reporting mosquitoes.anses.fr
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