Dangerous caterpillars in forests: Foresters warn walkers | Rzeczpospolita (PL) | 01KXBX1M3RRR41XJCK8GA8JQWG

Foresters in the Rzepin Forest, located in Poland's Lubusz Voivodeship, have issued warnings to the public regarding the appearance of the pine processionary caterpillar (Thaumetopoea pityocampa). The larvae of this moth species feed on pine needles and pose a risk to both humans and animals.

The caterpillars are recognizable by their distinctive 'procession' behavior, moving one after another to form a line. Foresters strongly advise against approaching the caterpillars or touching their nests. Special caution is urged for hikers, families with children, and dog owners, as pets might inadvertently come into contact with the insects. It is recommended not to attempt to remove the caterpillars independently, even through clothing.

The primary danger stems from the microscopic hairs covering the caterpillars' bodies. These hairs detach easily and can cause severe allergic reactions upon skin contact, with symptoms resembling burns. The pine processionary caterpillar likely arrived in western Poland through road transport from northern Poland, where it naturally occurs in pine forests on sandy soils and dunes. It has been observed in the Lubusz Voivodeship, particularly along the A2 highway.

While the pine processionary caterpillar is a concern, foresters note that the oak processionary caterpillar (Thaumetopoea processionea), which originates from southeastern Europe, is considered a more dangerous species. Visitors to affected forest areas are advised to avoid places with visible caterpillar clusters. Pets should be kept under control to prevent them from approaching the insects or their nests. In case of direct contact with the caterpillar hairs and subsequent allergic reactions, immediate medical consultation is recommended. Informing the doctor about the contact with the insect is crucial, as burn-like symptoms can be non-specific and difficult to treat without this information.