Last modified: April 23, 2019, 12:44 p.m.
This is a not so common species in Belgium.
The caterpillar lives in a shiny brown black sheath case of about 9 mm when fully developed. A series of rings is often clearly noticeable as well as a translucent yellowish ventral keel at the narrowing end. The mouth angle is 50–60°.
See also bladmineerders.be.
The eggs are deposited on the leaves of the hostplant. The larvae construct sheath cases made of silk and leafs and are predominantly found at the underside of leafs. Feeding continues after hibernation and the caterpillars are full-grown in May and pupate near ground level. Although adults sometimes fly in the sunshine they are mainly nocturnal and come to light.
This species is on the wing in June and July.
The larvae feed on a wide range of plants of the Lamiaceae family like Clinopodium, Glechoma, Lycopus, Origanum, Prunella, Salvia, Mentha, Nepeta, Stachys and probably also on Thymus.