Treble-bar - Aplocera plagiata

Alternative names

Wingspan 27-40 mm. On of our larger Geometrids, it is rather difficult to tell apart from the less common Lesser Treble-bar (A. efformata), which however has a more angled inner cross-line on the forewing. Abdomen shape should be checked - see the image at:

Identification difficulty

Calcareous grassland, heathland, moorland, woodland rides, sand-dunes and sea cliffs.

When to see it

In the south, there are two generations of this moth, flying in May and June, then again in August and September. In the north of England and Scotland, there is usually just one brood, flying in July and August.

Life History

The larvae feed on St.John's-wort.

UK Status

It is fairly common over most of Britain. In a recent survey to determine the status of all macro moths in Britain this species was classified as common.

VC55 Status

Fairly common in Leicestershire and Rutland. L&R Moth Group status = A (common and resident)

70.192 BF1867

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map