Common wherever there are ash trees throughout most of the British Isles. Widespread and common in Hampshire and on the Isle of Wight. Wingspan 14-17 mm. The typical form is distinctive and easy to recognise, less so the dark form rustica, which is considered to be a separate species by some authors. Larva mines leaves and bark of Ash, subsequently burrowing into and feeding on branches.
The abundance in each month is indicated as follows:
No records Very occasional Irregular Uncommon Off-peak, but not unusual Off-peak, but not unusual Main flight time