Last modified: April 16, 2021, 11:39 a.m.
The larva lives in the shoots, sometimes several larvae in each shoot, which then swells. Frass is removed through a small hole in the stem.
Pupation inside the stem, the pupal period lasts only 14 days.
The adults are active at night and come to light.
One generation a year: from early July till late August.
Wet places in forests, marshes, along brooks.