Geometridae: Ennominae

1915 (ABH70.236) September Thorn Ennomos erosaria, ([Denis & Schiffermüller], 1775)

KR07636

 Photo © Barry Dickerson
September Thorn
 Photo © Barry Dickerson
 pre-2000
 2000-2009
 2010-2019
 2020-onwards
near Llanfyllin, N. Powys. 18th Sept. 2015. MV trap. Male.
near Llanfyllin, N. Powys. 18th Sept. 2015. MV trap. Male.
 Photo © Nick Greatorex-Davies
near Llanfyllin, N. Powys. 18th Sept. 2015. MV trap. Male.
near Llanfyllin, N. Powys. 18th Sept. 2015. MV trap. Male.
 Photo © Nick Greatorex-Davies
Whitelye, Monmouthshire. 29th July 2020. Light trap. Male. 1 of 2.
Whitelye, Monmouthshire. 29th July 2020. Light trap. Male. 1 of 2.
 Photo © Nick Greatorex-Davies
Whitelye, Monmouthshire, 29th July 2020. Light trap. Male. 2 of 2.
Whitelye, Monmouthshire, 29th July 2020. Light trap. Male. 2 of 2.
 Photo © Nick Greatorex-Davies


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: Common

Habitat

Woodland and gardens.

Regional Information

Recorded in 18 (6.7%) of the 270 2km squares of Huntingdonshire.

Last recorded in August 2012

Recorded date range (Adult): 06 July to 26 September

Similar Species
Whitelye, Monmouthshire, July 2008
Whitelye, Monmouthshire, July 2008
 Photo © Nick Greatorex-Davies
August Thorn Ennomos quercinaria
 Photo © Barry Dickerson
Canary-shouldered Thorn Ennomos alniaria


Larva/Leafmine:
Larva Type:
With lumps, bumps or horn(s)
Colours:
Grey, brown
No. of Proleg Pairs:
2