Last modified: Aug. 20, 2021, 12:39 p.m.
A not so common and local species in Belgium, more observed in the north of the country.
The adults have been observed from June till August. They fly at dusk and later come to light.
The larva feeds on the young shoots of Phragmites or Glyceria maxima, often below the surface of the water. When it has finished feeding in a stem it cuts off a piece of reed about its own length and floats on this on the surface of the water until it reaches a new stem. Pupation in a stem below a prepared exit-hole.