Last modified: April 13, 2021, 10:34 a.m.
A rather common species throughout Belgium.
The adults fly in May-June and again in August. The males are active in afternoon sunshine, the females towards sunset.
The larva of the first generation lives in the stem, that of the second in spun terminal leaves or a flower-head of Trifolium sp., mainly Trifolium pratense and Trifolium repens, also on Lotus corniculatus. The full-fed larva hibernates. It pupates in a cocoon spun amongst leaf-litter.