Fairly common.

Mining the leaves of Quercus spp. or Castanea with larva feeding in June/July and September/October. In a long broad gallery with dispersed frass in the latter part of mine.

Verification Grade Comment: If on sweet chestnut otherwise needs breeding out and dissecting

Recorded in 53 (38%) of 140 10k Squares.
First Recorded in 1982.
Last Recorded in 2022.
(Data up to end 2022)