Geometridae: Ennominae

07633 August Thorn Ennomos quercinaria, (Hufnagel, 1767)

BF1912 (ABH70.233)


General Information

The flight season of this species actually overlaps with the September Thorn, so this cannot be used to distinguish them.


Pupates in the leaves of the food plant.

Overwinters as Overwinters as an egg.
Both sexes readily come to light, sometimes in numbers.
Often found at rest during day

Forewing length: 18-22mm.
Foodplant(s): Pedunculate Oak (Quercus robur), Sessile Oak (Quercus petraea), lime (Tilia spp.), elms (Ulmus spp.), Beech (Fagus sylvatica), birches (Betula spp.), hawthorns (Crataegus spp.), Blackthorn (Prunus spinosa)
Flying: One generation, mid August-late September
UK Presence: Resident
National status:


Woodland, parkland, hedgerows, scrub and gardens.

Regional Information

There are no records in the system yet in Bulgaria.

Similar Species
Large Thorn Ennomos autumnaria
Canary-shouldered Thorn Ennomos alniaria
Cherven, Western Rhodopi Mtns., 29th June 2012, female.
Cherven, Western Rhodopi Mtns., 29th June 2012, female.
 Photo © Nick Greatorex-Davies
Dusky Thorn Ennomos fuscantaria
September Thorn Ennomos erosaria

Larva Type:
With lumps, bumps or horn(s)
Brown, green
No. of Proleg Pairs: