Food Plant: Elsewhere: Quercus spp., (Oak), Castanea sativa (Sweet Chestnut)

Mine: from August

Notes: Forms an upper surface blotch mine which is mostly greyish to black with dark concentric lines in the mine. The centre of the mine can sometimes be a little red/orange, but the greyish/dark concentric lines in the rest of the mine are clearly darker than in the other species - T.ekebladella and T.dodonaea. It cuts out the early mine to pupate (as shown), which the other species do not as they pupate in the mine in the leaf.

Known in the Netherlands and Belgium but not yet in the UK.

Data: 17.viii.2026, Zwettl, Austria

Image:© Ewald Altenhofer