Last modified: Oct. 4, 2020, 9:57 a.m.
A rare species in Belgium, at first only known from some old records in the Sonian Forest (BR). During the last decennia, the species seems to expand its area northwards. It is now found widespread in Belgium, but still always rarely.
An oval tentiform mine on the underside of a leaf, most of the time between two secondary veins, and mainly situated near the basis of the leaf. No distinct longitudal central fold, but some faint folds close to each other. The upperside of the mine turns to yellow, at first with a green island in the centre, but in the last stage completely yellowish. The dark frass is concentrated in a corner of the mine.
See also gracillariidae.net and bladmineerders.be.
A white, circular cocoon.
Pupation inside the mine. The species hibernates in the pupal stage, in the cocoon within the fallen leaf between leaf litter on the ground. After emergence of the adult, the pupal skin protrudes from the mine.
Two generations a year: April–May and August–September.
The species is monophagous on Populus, with a preference for Populus nigra, but it has also been recorded on Populus x canadensis, P. deltoides and P. nigra var. italica.
Forests, road sides, parks.