Seq # 650010010

Thaumetopoea processionea (Linnaeus, 1758) Species

Last modified: Oct. 14, 2023, 3:40 p.m.

A common species in Belgium. A species of fluctuating occurrence: sometimes absent, sometimes a pest in oak forests. It has mainly been observed in the Kempen region, but occurs also in many other regions.


Family: Notodontidae > Subfamily: Thaumetopoeinae > Genus: Thaumetopoea > Species: Thaumetopoea processionea
Vernacular names
Eikenprocessierups (NL), Oak Processionea (EN), La Processionnaire du Chêne (FR), Eichen-Prozessionsspinner (DE)
First mention in Belgium
De Sélys-Longchamps E. 1837. Catalogue des Lépidoptères ou Papillons de la Belgique, précédé du tableau des Libellulines de ce pays. — — : 1–29. On page 25 (as Bombyx Processionea). view page




Wingspan: 25–35 mm.

Museum specimens

Specimens in nature


Watch out for the minute, severely urticating hairs on the dorsum of the older larvae, these are readily dispersed by the wind and can cause persistent and often severe health problems.


Hibernates as an egg.
The adults come to light.

No pictures yet!

Flight periods

The adults fly mainly in July and August, sometimes till late September, though some specimens have been observed as early as 28 May.

Observed on

Host plant (genera):

The larva lives on Quercus.

No pictures yet!