Last modified: Aug. 18, 2020, 9:40 p.m.
A very rare and rapidly declining local species in Belgium, nowadays only observed in LG.
The larvae feeding mainly on cultivated Delphinium and on Aconitum.
The young larva hibernates at the roots of the food plant, and later lives and feeds in a small capsule constructed from a folded and partially withered leaf. After the last instar, the bright green larva lives in the open on the leaves of the food plant and can be found in May and June, and as a partial second generation in August.
Pupation take place in a large yellow cocoon attached to the underside of a leaf on the food plant.
The adults fly in one generation a year onwards from mid May towards August, sometimes a partial second generation occurs till October, although observation data in Belgium are from 15 June till 08 August. They come to light.