Germany's oak processionary moth spreads, prompting local actions in Hamburg and Saarland

Health officials warn that the oak processionary moth (Thaumetopoea processionea) can cause severe skin irritation, eye inflammation and respiratory problems via its toxic hairs. In Hamburg, the Senate relies on reactive measures such as vacuuming nests and occasional pheromone traps, but there is no city‑wide monitoring system, reporting requirement, dedicated funding or a coordinated eradication plan. External contractors carry out the work and costs are borne by individual districts.

In the Saarland, the pest has been reported in every forest district of the Saarforst. Authorities have installed warning signs and, where needed, closed affected areas. The spread is strongest in warm, oak‑rich zones around Saarbrücken, the Bliesgau and the Saargau, as well as in parks, roadside greens and cycling routes. The regional environment ministry advises heightened caution for the public, especially children, in these habitats.