Last modified: Dec. 3, 2024, 3:27 p.m.
A not so common species in most areas of Belgium.
Native
Wingspan 22–26 mm.
Hindlegs brown-grey, distally gradually paler brown.
See also G. ochrodactyla, hind legs.
The larva lives in the stem of its food plant. It hibernates in the roots. In spring it mines the young shoots causing them to drop.
Pupation on the stem or on a leaf of the food plant.
The adults are active at dusk and come to light.
One generation a year from July till early September.
Oligophagous, mostly in Achillea.