Authorities in Germany and the United Kingdom have closed parks and playgrounds due to an infestation of toxic oak processionary caterpillars.
The spread of these larvae poses a significant public health risk because their microscopic hairs cause severe skin rashes and respiratory irritation. As warmer European temperatures enable the species to expand its range, urban green spaces are becoming hazardous to residents and visitors.
In Germany, the outbreak coincided with a period of record-breaking heat in June 2026 [1]. The infestation became severe enough to force the closure of outdoor spaces, including areas in Berlin, to protect the public from the insects' poisonous hairs [1], [2].
"Our next story takes us to Germany, where authorities have closed parks and playgrounds, not because of extreme heat but because of poisonous caterpillars," Esme Nicholson of NPR said [1].
The issue is not limited to Central Europe. In the United Kingdom, the Hounslow Council in London issued warnings regarding the presence of the caterpillars [3]. Reports indicate that infestations in certain areas were first noted between 2021 and 2022 [3].
The oak processionary moth larvae are particularly dangerous because their hairs can become airborne. When these hairs contact human skin or are inhaled, they trigger an inflammatory response. This biological threat has turned routine summer activities, such as visiting a playground or walking through a park, into potential health emergencies.
Local governments are currently monitoring the movement of the larvae and implementing containment strategies to reopen public spaces. The combination of rising temperatures and the caterpillars' ability to migrate has created a recurring seasonal challenge for European urban planners [1], [4].
“Authorities have closed parks and playgrounds, not because of extreme heat but because of poisonous caterpillars.”
The expansion of the oak processionary caterpillar is a direct indicator of how shifting climate patterns affect urban biodiversity and public health. As record-breaking heat becomes more frequent in Europe, the geographic range of invasive or toxic species shifts northward, forcing cities to adapt their land management and public safety protocols to mitigate biological risks.
