Treble Bar Geometridae

Aplocera plagiata (Linnaeus, 1758)

Description: Wingspan 37-43mm. Adults have pale grey forewings marked with 3 dark bands. The bands are variable in width and intensity. Small streak at the apex of the forewings. The hindwings are unmarked and pale grey.

Key Identification Features:

Sets:  male upperside

Flight Period: Late June to the end of September.

Status: Widely distributed throughout most counties. Frequently found in large numbers at some of its well-known coastal localities and some inland areas of Armagh, Fermanagh and Londonderry. It has also been recorded from Rathlin Island, Antrim.

Ecology: An attractive species that occurs in greatest numbers on coastal heaths and grassland. Inland it is commonly recorded from the limestone uplands of Fermanagh and some woodland areas. Adults come to light frequently and are occasionally disturbed from vegetation during the day especially in coastal sites. The larvae can be found throughout the autumn and again in spring on St John's-wort Hypericum spp. It overwinters as a larva.

World Distribution: Throughout Europe, western India and Japan.

Bradley & Fletcher number: 1867 Agassiz number: 70.192

Additional information:

UK Moths account


 Thompson, R. S. & Nelson, B., 2003 (Oct 2). [In] The Butterflies and Moths of Northern Ireland