Last modified: July 25, 2019, 7:03 p.m.
A rather species throughout Belgium.
The larva lives in the stems and roots of the hostplant. Infested stems are recognizable by the brown frass in the upper part of the stem. The larva overwinters in the rootstock. In spring it pupates in the dead stem, a little below the prepared exit hole. The pupa protrudes the exit hole before emerging.
The adults fly from May till August. They are active from dusk onwards and later come to light.