Common in oak woodland and areas with scattered oaks throughout the British Isles. Widespread and common in Hampshire and on the Isle of Wight. Wingspan 15-20 mm. Very variable, plain forms can be confused with plain forms of Y. parenthesella. Larva feeds on Oak leaves, beneath a silken web.
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