Established in more than 80 mainland départements by early 2026, the tiger mosquito (Aedes albopictus) is no longer just a summer nuisance: it is a potential vector of dengue, chikungunya and Zika. To slow its spread, a long-experimental method is scaling up this year: the release of sterile male mosquitoes, now tested by drone over several French cities.
How the sterile insect technique works
The sterile insect technique (SIT) uses no insecticide. The principle is simple:
- male mosquitoes are mass-reared in the laboratory;
- they are sterilised by irradiation, which destroys their ability to reproduce;
- once released, they mate with wild females;
- the eggs laid are non-viable, collapsing the population in the next generation.
An important detail for residents: males do not bite. Only females take blood in order to lay eggs. The releases therefore do not increase the number of bites.
What changes in 2026: the drone
Until now, sterile males were released from vehicles fitted with open cages driving through the streets. In 2026, the trial takes a new step: drones drop millions of sterile males directly over urban areas, covering hard-to-reach neighbourhoods much faster.
Early results are encouraging. In Montpellier (Hérault) and Brive-la-Gaillarde (Corrèze), tiger mosquito populations were cut in half in the very first year of the experiment. If the 2026 trials confirm these figures, a larger-scale rollout could begin as early as 2027.
The sterile insect technique is a collective measure led by health authorities. It lowers the overall pressure of a neighbourhood but does not replace protecting your own home.
Why vigilance is rising
Interest in these methods stems from the rise in locally transmitted diseases. In 2025, France recorded several dozen cases of locally acquired dengue and clusters of chikungunya, pushing some southern départements into heightened vigilance. A mild winter and an early, wet spring in 2026 created ideal conditions for advanced proliferation.
The Paris region is not spared: more than 200 municipalities in Île-de-France are now colonised by the tiger mosquito.
What you can do, right now
Sterile-male releases act at the neighbourhood scale, but the fight starts at home. The most effective step remains removing breeding sites: empty saucers, buckets and watering cans every week, cover rainwater butts and clean out gutters.
Where the presence is heavy on your property or in a shared building, a targeted professional treatment usefully complements collective measures: breeding-site diagnosis, tailored treatment and prevention advice. Our technicians operate throughout the Paris region, including emergencies. Contact us for a diagnosis, or see our pricing.
The tiger mosquito is here to stay. Between collective innovations like SIT and prevention at home, it is the combination of the two that pushes back the risk.
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