Overview
- This week renewed detections in Bavaria and earlier findings across Rheinland‑Pfalz, Hessen and Baden‑Württemberg have pushed local authorities to move from monitoring to active control.
- Municipalities have formed working groups, contracted licensed pest‑control companies and are trialing hot‑water and hot‑foam treatments as part of coordinated response plans.
- Tapinoma magnum is deep black, has workers of varying sizes about 2–5 millimetres, forms broad multi‑lane trails, emits a lemon/acetone‑like odor when disturbed and remains active at low temperatures.
- The species has been linked to damage in public spaces and infrastructure, including a 2025 playground closure and power and internet outages in Kehl and undercutting at a Hösbach cemetery.
- Experts say the ants are chiefly spread in large plants, root balls and transported soil from the Mediterranean so authorities advise reporting sightings to the Ordnungsamt, avoiding private insecticide use and preferring native plants to reduce risk.