Common resident.

Most easily recorded from mines on Ulmus spp with larva feeding in July and September/October. In a long gallery mine, sometimes following the leaf margin with dispersed frass in the early part of the mine. Larva yellow, exiting the mine via the upper surface of the leaf.
Sometimes larval mining causes part of a green leaf to turn yellow, if it interferes with the sap supply to distal part of leaf.

A sexually dimorphic species, the males having black heads, females orange.

Verification Grade Comment: Exit-hole must be shown or larval colour

	Mine: Either the leaf or a good photograph required

Recorded in 79 (56%) of 140 10k Squares.
First Recorded in 1869.
Last Recorded in 2022.
(Data up to end 2022)