Oak processionary moth spreads in German cities, prompting health alerts

The oak processionary moth (Eichenprozessionsspinner) has advanced to the fifth larval stage in Karlsruhe, Germany, where the city’s garden department applied the biocide Foray ES in a prophylactic treatment that residents say is reducing new infestations. The caterpillars’ toxic hairs can cause severe skin irritation, itching, eye inflammation and breathing problems for people and pets.

In the Main‑Kinzig district, forest officials report a rise in nests and warn visitors to keep distance from affected oak trees, especially in playgrounds and park areas. Removal is carried out by mechanical suction or targeted chemical/biological treatments, though a full‑scale forest eradication is deemed impractical. Authorities advise the public to avoid contact with the hairs, wash any exposed skin, change clothing promptly, and seek medical help for serious reactions.