Germany warns of oak processionary moth outbreak

German cities are reporting a sharp increase in oak processionary moth (Eichenprozessionsspinner) caterpillars. Hannover's authorities warned that the insects have spread more widely than in previous years, especially in the north and northeast districts, and have begun removing nests and installing warning signs. The caterpillars’ microscopic hairs contain a toxin that can cause skin irritation, respiratory difficulties and, in rare cases, severe allergic reactions.

In Hamburg, the environmental office recorded around 600 infested trees in one district, with additional sites in other boroughs. Although no parks or sports facilities have been closed, the city is promptly vacuum‑extracting nests and advising residents not to touch the insects. Funding for removal costs is being clarified. Similar infestations have led to the temporary closure of parks, playgrounds and sports areas in Berlin, Brandenburg and Baden‑Württemberg.

Experts link the moth’s expanding range to warmer, drier springs caused by climate change, which favour its development. Municipalities are coordinating efforts to protect public health by monitoring trees, removing nests, and informing the public of the hazards.