Tapinoma
magnum

Origin and spread

Tapinoma magnum is native to the Mediterranean region and North Africa. In its native habitats, the species is integrated into a stable ecosystem through natural predators and interspecific competition and causes no significant damage. Through global trade – primarily via the import of Mediterranean pot plants (such as olive trees) and contaminated soil – it has made its way across the Alps.

• 2009: First official sightings in Germany.
• By 2023: Widespread expansion, particularly in the warmer regions of southern and western Germany (Baden-Württemberg, Rhineland-Palatinate, Hesse) and in Switzerland.
• Today (2026): Due to mild winters and ongoing global warming, the ant has long since reached the north as well. Established colonies have now even been confirmed in federal states such as Schleswig-Holstein and Lower Saxony.

Biological characteristics and colony structure

The evolutionary success of Tapinoma magnum in new habitats is based on specific biological and ethological characteristics that distinguish it from native ant species.

Unicoloniality and supercolonies

Native ant species (such as Lasius niger) organise themselves into genetically distinct territories and fight off foreign colonies of the same species. Tapinoma magnum, on the other hand, exhibits the phenomenon of unicoloniality. Individuals from different nests cooperate with one another without restriction. This results in gigantic supercolonies that can extend over several hectares and entire urban neighbourhoods.

What damage does Tapinoma magnum cause?

The immediate danger to humans from bites is a nuisance, but the real potential for damage is of an economic, structural and ecological nature.

Infrastructure

The ants dig tunnel systems up to two metres deep. They carry away tonnes of sand from beneath pavements, terraces and roads. The result: paving stones sink, and roads become unstable. In affected towns, playgrounds have already had to be closed for safety reasons.

Technology & Electronics

Attracted by the cosy warmth, the insects make their way into electrical distribution boxes, server rooms and telecommunications equipment. There, they gnaw through insulation, which repeatedly leads to short circuits, traffic light failures and widespread internet outages.

Buildings & Living Spaces

Ants find even the tiniest crack in the foundations. They invade homes, gnaw through insulation materials to build nests, and contaminate food in the kitchen.

Control of Tapinoma magnum

Professional pest control operators and local authority services rely on a combination of physical measures and barriers, as well as biological methods tailored to the specific behaviour of the giant gland ant.

1. The hot water foam method (thermal destruction)

In urban areas and open spaces, this biocide-free, physical method has established itself as the primary measure.
Water is heated to over 95 °C and injected directly into the nest structures via special lances under low pressure. A purely plant-based foaming agent (e.g. based on cornflour or coconut oil) is added to the water. This foam acts as an insulating layer on the surface. It prevents the heat from escaping upwards too quickly, allowing the hot water to seep deeper into the tunnels. The thermal energy denatures the proteins of the ants, the brood and – crucially – the queens in the upper and middle layers of the nest.

2. Physical barriers

Diatomaceous earth powder is used to protect sensitive interior spaces, electrical distribution boxes and building foundations. Diatomaceous earth consists of the fossilised shells of diatoms. The microscopically sharp edges destroy the protective wax layer (cuticle) of the ant’s exoskeleton on contact. This leads to physical dehydration of the ants, without allowing them to develop resistance. However, this method requires absolute dryness to be effective.

3. Use of entomopathogenic nematodes

Nematodes of the species Steinernema feltiae are natural enemies of ants and cause them to flee. After the upper and middle layers of the nest have been treated with hot water, the nematodes are introduced into the nests. These penetrate deep into the nests and scare the Tapinoma ants, causing them to flee the nests in panic. Once on the surface, they can then be controlled using diatomaceous earth.

Practical conclusion: The eradication of a Tapinoma magnum supercolony absolutely requires a large-scale and coordinated approach. If only a single plot is treated, the ants will quickly re-infest the area via the underground tunnels connecting neighbouring plots. Sustainable population management is therefore usually only achievable through coordinated measures across entire streets or local authorities.