Geometridae: Ennominae

07636 September Thorn Ennomos erosaria, ([Denis & Schiffermüller], 1775)

BF1915 (ABH70.236)


General Information

The flight season of this species overlaps with that of the August Thorn so this cannot be used to distinguish them.


Pupates in spun leaves.

Overwinters as Overwinters as an egg.
Both sexes readily come to light, sometimes in numbers.

Forewing length: 17-21mm.
Foodplant(s): oaks (Quercus spp.), birches (Betula spp.), lime (Tilia spp.), Beech (Fagus sylvatica)
Flying: One generation, July-early October
UK Presence: Resident
National status:


Woodland and gardens.

Regional Information

There are no records in the system yet in Bulgaria.

Similar Species
August Thorn Ennomos quercinaria
Canary-shouldered Thorn Ennomos alniaria

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