New outbreak of electric ants in the south of France sparks concern

A third outbreak of so-called ‘electric ants’ has been identified in Var, raising fresh concern that the invasive species could gain a foothold in the south of France.

The latest cluster, confirmed in March in Cavalaire-sur-Mer, adds to earlier detections near Toulon in 2022 and La Croix-Valmer in 2024, all within the same coastal department.

Ant expert and agronomist Luc Gomel, who has inspected the outbreak sites, told The Connexion that containment remains possible but depends on rapid action while the infestation is still geographically limited.

“The fact that we have detected them early means it is still largely in our hands, both in terms of controlling the spread and eradicating them,” he said.

However, he cautioned that uncertainty remains.

“We do not have enough hindsight to say whether this will go the same way as other invasive species,” he said, citing the lack of long-term data on the insect’s behaviour in this climate.

France has already seen other invasive species establish and spread rapidly, including the tiger mosquito and Asian hornet, raising questions over whether electric ants could follow a similar trajectory.

Tiny insect, outsized threat

Barely 1–2mm long and brown-orange in colour, electric ants (also known as little fire ants) are difficult to detect.

“Because of their size, they are effectively invisible until you are stung,” Mr Gomel said.

He added that at an early stage the species is often mistaken for ordinary ants, complicating identification.

Their sting, however, is distinctive: often described as a sharp electric shock, it can cause intense pain, swelling and, in some cases, severe allergic reactions including anaphylactic shock.

They also pose a risk to pets, which may be repeatedly stung around the eyes, sometimes leading to blindness.

The broader impact is ecological. Electric ants aggressively displace native insect species, attack birds and small mammals, and destabilise local ecosystems. 

They also protect and 'farm' aphids and other sap-sucking insects, increasing their numbers and indirectly amplifying damage to crops.

Once established, colonies can spread rapidly, aided by a dual reproductive system that includes cloning, and may contain multiple queens in very small areas, making eradication particularly difficult.

The form now present in the region appears adapted to cooler and drier conditions, increasing the risk of longer-term establishment.

Mr Gomel said different strains of the species appear to behave differently depending on origin.

He added that the ants detected in Spain are not the same variant as those now found in Var, noting that the populations in France appear closer to those identified in Cyprus and Israel.

“They come from Argentina, where they have spread far to the south in relatively dry and cold conditions,” he said, suggesting the species may be more adaptable to France's climate than initially assumed.

New eradication strategy

Containment efforts have been hampered in the past by regulatory and funding constraints, as well as the insect’s behaviour. Traditional bait traps have proved largely ineffective, as the ants often avoid them.

Now, authorities in Var are deploying a new approach. For the first time in France, insecticide will be dispersed directly over affected areas rather than confined to bait stations.

Around four hectares in Toulon and La Croix-Valmer are due to be treated over several months, with drones used in hard-to-reach terrain.

Officials say the quantities used are minimal and targeted, and remain cautiously optimistic that eradication is still possible at this stage.

Experience elsewhere suggests delays can prove costly: Australia has spent tens of millions of euros tackling the species since the mid-2000s.

Mr Gomel said that while the situation remains serious, control is still feasible if human pathways are managed.

“What is certain is that the ants are spread by human activity, particularly through green waste,” he said, adding that “on their own, they cannot travel far.”

How to recognise electric ants

Electric ants are extremely small, slow-moving and light brown to ginger in colour. Colonies are often hidden underground in soil, plant pots or debris, making them difficult to detect until stings occur.

Authorities advise residents not to attempt to handle or treat suspected infestations themselves, as standard shop-bought insecticides are largely ineffective.

If you suspect their presence, report it to local authorities or specialist bodies such as FredON PACA or the Office français de la biodiversité. Early detection is considered critical to preventing wider spread.

Because there are more than 200 ant species in France, many of which are harmless and visually similar at this scale, authorities stress that identification based on appearance alone is not sufficient. Confirmation should be left to specialists to avoid false positives.

In case of a sting, most cases involve intense but localised pain and swelling. 

Anyone experiencing signs of a severe allergic reaction, such as difficulty breathing or widespread swelling, should seek urgent medical attention.