Oak processionary moth spreads across Denmark and Poland, prompting alerts and control measures

The oak processionary moth, known in the media as the “larva from hell,” has been confirmed in several Danish municipalities, including Odense, Kerteminde, Nyborg, Morsø, Amager, Nordfyn, Herning, Slagelse and others. Its larvae carry microscopic hairs that can cause severe skin irritation, eye inflammation and allergic reactions in humans and pets. Danish authorities have launched public reporting tools such as the “Arter” app, the “Tip Tak” app and the “Giv et praj” service, urging residents to photograph and submit any sightings. Municipalities are mapping potential hotspots, preparing rapid‑response plans and coordinating with the Nature and Animal Welfare Ministry, which has raised the issue in parliament.

In Poland, the same species has recently been detected, with the State Forests reporting nests on oak trees in several regions. Experts attribute the spread to imported oak saplings and note that warm, dry summer conditions favour the moth’s development. Polish foresters warn of increased risk of skin and eye reactions and advise the public to avoid contact with nests.

Scientists suggest monitoring, the use of natural predators such as tits, and careful management of oak plantings as part of longer‑term control strategies. The coordinated response in both countries reflects growing concern over the public‑health impact of the invasive moth.