Climate Change Drives Oak Processionary Moth Expansion into Northern Germany, Berlin Faces Crisis

Berlin has faced a significant infestation of oak processionary moths this summer, forcing the closure of several parks and outdoor swimming pools. Experts indicate that these toxic caterpillars, historically confined to southern Germany, are expanding northward due to climate change, creating new public health concerns for northern cities like Berlin.

Since early June, authorities have cordoned off areas around oak trees in parks and playgrounds, including Görlitzer Park. Residents have reported the insects spreading to residential walls and balconies. The caterpillars possess toxic hairs containing irritating proteins, which can cause skin rashes, eye inflammation, and respiratory issues upon contact.

Dr. Christoph Stang of the German Environment Agency (UBA) notes that while the species was once considered absent in regions like Saxony, it is now ubiquitous across Germany. Dr. Henrik Hartmann of the Julius Kühn-Institut (JKI) attributes this to warming spring temperatures, which synchronize larval hatching with oak leaf budding, boosting survival rates. Julian Bethke of the Nature and Biodiversity Conservation Union (NABU) adds that consecutive hot, dry summers since 2018 have created ideal habitats, pushing the moths from rural woodlands into urban environments.

To manage the infestation, Berlin authorities are using industrial vacuums to remove nests. Additionally, a crowdsourcing platform, the "EPS Radar," has been established to track infestations, with over 8,600 reports logged nationwide by June 20, with Berlin serving as a primary hotspot.