Last modified: Sept. 16, 2023, 9:59 a.m.
A rather common species throughout Belgium.
Native
Wingspan: 22–25 mm.
Genital control is necessary only for the darker colored specimens in this species for positive identification, see O. latruncula Linnaeus, 1758 and O. versicolor (Borkhausen, 1792).
Hibernates as a larva and pupates among the roots of the food plant.
The adults come to light and sugar.
The adults fly in one generation a year: from mid-May till late August.
The larva lives in the roots and stems of various grasses like: Dactylis glomerata, Elytrigia repens or Phalaris arundinacea.