Toxic 'hell' larva spreads in Denmark, could reach southern Norway

A toxic caterpillar species, officially named eikeprosesjonsspinner and nicknamed “larven fra helvete” (“the larva from hell”), has rapidly expanded from Odense to large parts of Denmark. The larvae’s poisonous hairs have forced the closure of playgrounds and a kindergarten in Odense, and municipal authorities have urged residents to avoid affected paths. Odense spent about two million kroner on measures such as nest removal and vacuuming, but the effort has yielded limited results. The insects live only a few months, yet their hairs remain in the environment for years, creating a persistent hazard.

Health officials warn that the caterpillar could establish itself in southern Norway, where conditions are suitable for breeding. A senior researcher at Denmark’s Nibio notes that insects can be unintentionally transported on vehicles. Although unverified reports of sightings have emerged from Agder and eastern Norway, no confirmed presence has been reported. Danish ministries have launched a website and app to provide information and support to municipalities dealing with the outbreak.