Germany's oak processionary moth outbreak triggers health alerts in Berlin and beyond

The oak processionary moth (Eichenprozessionsspinner) is causing differing responses across German cities. In Berlin, the city’s sports department has closed several facilities and cancelled a family festival as officials demand more support and funding to manage the infestation. Munich has recorded only a single case this year, while Düsseldorf has installed pheromone traps on about 100 oak trees but has not confirmed any active infestations.

Health officials warn that the caterpillars’ tiny hairs can irritate skin, eyes and respiratory passages, and wind can disperse them over large areas. The German Weather Service (DWD) now provides a daily early‑warning map that shows the developmental stage of the larvae, noting that the western Rhine region is the most advanced, with Berlin’s eastern region only at a mid‑development stage.

Experts also note that not all similar‑looking caterpillars are dangerous; harmless web‑spinning moths may be confused with the oak processionary moth. Local authorities advise removal of nests in high‑risk locations by professionals and provide information on municipal websites. The situation highlights how warmer, drier springs are influencing pest outbreaks and prompting varied municipal containment strategies.