Grass Emerald

  • Grass Emerald
    Grass Emerald
  • Grass Emerald
    Grass Emerald
  • Grass Emerald
    Grass Emerald
  • Grass Emerald
    Grass Emerald
  • Grass Emerald
    Grass Emerald
  • Grass Emerald
    Grass Emerald
  • Grass Emerald
    Grass Emerald
  • Grass Emerald
    Grass Emerald

Scientific name: Pseudoterpna pruinata

Mid-June to August with an occasional second generation from September to October. Common and well distributed throughout Britain. A beautiful blue-green moth which fades to greyish-white with age.

The only Emerald moth found in mainland Britain with jagged dark green or black cross-lines, the others having white cross-lines.

The adults fly at night and are attracted to light. They are often disturbed from vegetation during the day. The caterpillars can be found from July to early the following June overwintering as tiny larvae.

Size and Family

  • Family – Emeralds (Geometridae)
  • Medium Sized
  • Wingspan Range – 30-38mm

Conservation Status

  • UK BAP: Not Listed
  • Common

Caterpillar Food Plants

Gorse (Ulex europaeus), Broom (Cytisus scoparius) and Petty Whin (Genista anglica).

Habitat

Heathland, moorland, open woodland and shingle beaches. Also on gravel pits and roadside embankments where Gorse and Broom are planted.

Distribution

  • Countries – England, Wales, Scotland and Ireland
  • Common. Well distributed in England, Wales, western Scotland, Ireland and on the Isle of Man. Limited records on the Channel Islands.