Treble-bar


The treble-bar or St. John's wort inchworm is a moth of the family Geometridae. the species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. It is found throughout the Palearctic region and the Near East.
This species varies considerably in size and colouration but is generally grey with three characteristic dark fascia across each forewing, giving it its common name. The hindwings are pale grey or buff. One or two broods are produced each year. In the British Isles, the adults can be seen at any time from May to September. The species flies at night and is attracted to light.
The larva is also very variable, being green to reddish brown with alternating darker and lighter stripes. It feeds on various species of St John's wort. It overwinters as a small larva.

Subspecies