Carsia sororiata, the Manchester treble-bar, is a moth of the Geometridae family. It is found in northern and central Europe, the Urals, Siberia, the Far East, northern Mongolia and in North America from Alaska to Newfoundland and to New Hampshire. Adults are on wing from July to August. The larvae feed on various Vaccinium species (including Vaccinium uliginosum, Vaccinium oxycoccos and Vaccinium myrtillus) as well as Rubus arcticus.