With the discovery of new outbreaks in the Var region, concerns are rising among both authorities and residents as they confront an invasive species that is both aggressive and hard to eradicate.
An invasive, ultra-adaptable fire ant
First detected on mainland France in 2022, the fire ant, also known as the electric ant and scientifically named Wasmannia auropunctata, originates from South America. It has since taken root in the Var, with several outbreaks identified, notably in Toulon and La Croix-Valmer. The situation, however, has worsened. In early April 2026, a third outbreak was confirmed, signaling a concerning advance of this invasive species. What makes the electric ant particularly formidable is its capacity to adapt. It colonizes both natural habitats and gardens, crops, and urban areas. According to France’s Office for Biodiversity, it can even reproduce by cloning in human-modified environments, accelerating its spread. A single queen can lay up to 70 eggs per day, and some colonies reach densities of up to 4,000 individuals per square meter. Another characteristic: these ants form interconnected networks of colonies. As a result, simply eliminating a nest does not always stop the invasion.
Why is the fire ant dangerous to humans?
Despite its tiny size—roughly 1.5 millimeters—the fire ant is far from harmless. Its sting, often described as burning, can cause intense pain, blisters, and even severe allergic reactions. Exposure to its venom causes irritations, blisters and sharp pain. But the main danger remains ecological. Listed among the world’s 100 worst invasive species, the electric ant is capable of decimating local insects, disrupting food webs, and threatening biodiversity. In some regions of the world, it has even contributed to the extinction of entire species.
Fire Ants: A costly, complex fight
Facing this invasion, the question of treatment is central. Yet, solutions remain limited and often costly. Contrary to common belief, conventional insecticides are generally ineffective against Wasmannia auropunctata. The reason lies in the colony structure and their ability to fragment. A poorly executed intervention can even worsen the situation by dispersing individuals. Authorities are testing more targeted methods, inspired by programs conducted in Australia or New Caledonia. These include using specific baits designed to reach the queens. But these operations carry a high price: eradicating a single outbreak can run around €200,000. A substantial investment that underscores the difficulty of containing this species. Moreover, prevention remains a key lever. The spread of the fire ant is often tied to the transport of plants or contaminated green waste. That’s why authorities advise limiting plant movements and reporting any suspicions.
What to do if you spot an electric ant?
With the fire ant’s spread, authorities are calling for citizen vigilance. Several simple steps can make a difference. First, it is crucial not to handle nests or attempt amateur treatment. A poorly controlled intervention can promote the dispersion of colonies. Next, any suspicious observation should be reported to the competent authorities. In France, there are surveillance systems to identify and track its spread. Finally, individuals are encouraged to monitor their gardens, particularly when buying or exchanging plants. Ants can hide in soil clumps, facilitating their spread. In the Var, where several outbreaks were active by April 2026, authorities fear a durable establishment of the species. A worrisome prospect, given that the fight against invasive exotic species already poses a major biodiversity challenge.
