Last modified: June 8, 2021, 5:55 p.m.
A very rare species and for the first time recorded from Belgium in 2019 (LX).
Pale yellow; head and prothoracic plate light brown with dark brown spots; pinacula grey.
The larva bores in the stem of the foodplant causing a weak gall and limiting the growth of the stem. It starts below and bores upwards reach the flower flower bud. The species hibernates in the larval stage. Pupation in a web in the feeding place or in a cocoon in the soil.
One generation a year: from late-June till mid-August.