September Thorn
Common NameSeptember Thorn
Scientific NameEnnomos erosaria
FamilyGeometridae
SubfamilyEnnominae
Wingspan (mm)40
Wing Patternstriped
Primary Colorspale yellow, orange, reddish-brown
HabitatDeciduous woodlands, parks, gardens, hedgerows
Geographic RangeEurope, extending eastwards into parts of Asia
Host Plantsoak, birch, elm, lime, hawthorn
Flight PeriodAugust to October
Flight Stylefluttering
Conservation Statusleast-concern
Lifecycle NotesOverwinters as an egg. Larvae hatch in spring and feed on deciduous trees, pupating in early summer, with adults emerging in late summer and autumn.
Identification TipsKey features include the pale yellowish-orange coloration, two wavy reddish-brown cross-lines on the forewings, and notably scalloped or serrated wing margins. Its flight period in late summer and autumn is also characteristic.
Description
A medium-sized moth with pale yellowish-orange wings marked by two wavy, reddish-brown cross-lines and distinctively scalloped margins, resembling a withered leaf.
