Invasive Tapinoma magnum ants: the new threat of summer 2026

Summer 2026 confirms an underlying trend: Tapinoma magnum, a small black ant native to the Mediterranean basin, continues to spread across France. In early July, an information meeting on how to fight this species in Loire-Authion (Maine-et-Loire) drew more than 200 people — a sign that concern is growing among residents and local authorities alike.

What is Tapinoma magnum?

Native to Italy and the Mediterranean coast, Tapinoma magnum is a shiny black ant whose workers measure just 3 to 4 millimetres. Adapted to warm, sunny climates, it takes advantage of a warming climate to colonise new regions, including the Île-de-France area around Paris.

Its distinctive trait: it forms supercolonies. Unlike common ants, several nests and several queens cooperate instead of competing. A single colony can therefore spread over dozens of metres, beneath terraces, pavements, flower beds and foundations.

Black and brown ant photographed in close-up on the ground

Why it is a problem

Tapinoma magnum is not directly dangerous to humans: its bites are harmless. The nuisance is mainly due to its numbers and its capacity to invade:

• gardens, terraces and interiors overrun by thousands of individuals;
• damage to fruit trees and disruption of local ecosystems (it preys on other insects);
• infiltration of homes in search of sugary food;
• galleries that can weaken paving and edging.

An uncontrolled supercolony spreads year after year. Acting early, at the first outbreaks, prevents an invasion on the scale of an entire neighbourhood.

How to recognise an infestation

Watch for these typical signs: continuous trails of small, very fast black ants, domes of earth or sand excavated between paving stones and slabs, and a presence that returns despite conventional surface treatments.

Preventing and treating effectively

Experts advise against the widespread use of consumer insecticides: often ineffective against supercolonies, they can also harm health and the environment. A few good preventive habits:

1. Remove sources of sugary food and store food in airtight containers.
2. Seal cracks and joints through which ants enter.
3. Reduce humidity around foundations and terraces.
4. Encourage a garden rich in local wildlife, which slows the spread.

Against an established supercolony, professional treatment is the most reliable solution: precise identification of the species, suitable baits and sustained treatment over time, including out of season. Contact us for a free diagnosis, or check our intervention rates. Our teams operate throughout the Île-de-France region, including emergency call-outs.