Last modified: March 2, 2021, 11:26 a.m.
A rare and local species throughout Belgium, but probably overlooked.
Feeds in summer and autumn in the spikes of the host plant. The larva hibernates and pupates in spring in the spike. Infested spikes are recognizable in autumn and winter by a small amount of frass between the grains, which are spun together and don't fall apart when touched.
The adults can be seen feeding on the flowers of the food plant.
The diurnal adults fly in one generation a year: from late April till June.