Oak processionary moth outbreaks reported in Switzerland and Germany

In the Swiss municipality of Holziken (Aargau), a nest of the oak processionary moth was found in a residential area. Authorities warned residents to avoid contact with the caterpillars and their silk nests, noting that the hairs can cause skin irritation, itching, respiratory problems, or allergic reactions in people and dogs. Public spaces, including school grounds and playgrounds, were inspected and found to be free of affected oaks. Residents were advised to wash any exposed skin and hair with water and to seek medical help for severe symptoms. Property owners with infested oak trees were directed to contact forester Leon Gsell of the Suhrental‑Ruedertal forest service for removal assistance.

In Bremen, Germany, the environmental department recorded about 6,200 oak processionary moth cases, a sharp rise from roughly 900 the previous year. The moth’s caterpillars pose health risks, and removal efforts focus on trees in high‑traffic public areas such as kindergartens, schools, playgrounds, and parks. Specialized firms vacuum the nests, with estimated removal costs of around €500 per tree, leading municipalities to anticipate total expenses of at least €100,000 this season.