Geometridae : Ennominae
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Photo © Nicky Rowberry,  Malvern Link 13/8/21

Immature stages

Similar West Midlands Species
August Thorn
Ennomos quercinaria
Canary-shouldered Thorn
Ennomos alniaria
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September Thorn
Ennomos erosaria

([Denis & Schiffermüller], 1775) 1915 / 70.236

A common resident found throughout the region.

A species of woodland, parkland and gardens.

Overwinters as an egg and adults come readily to light.

Note August and September Thorns cannot be separated on flight period; they both come out in July. There is no kink in the outer cross-line where it meets the wing and it generally holds its wings at a steeper angle.

Recorded in 101 (72%) of 140 10k Squares.
First Recorded in 1867.
Last Recorded in 2022.
(Data up to end 2022)
Additional Stats

Forewing: 17-21mm
Flight: July - October
Foodplant:   Oaks, birches, limes, Beech
Red List: Near Threatened (NT)
GB Status: Common
BAP Status: Declining (Research only)
Verification Grade:  Adult: 2
< Dusky Thorn | Early Thorn >
List Species Records   [Show All Latest]
Latest 5 Records (data up to end 2022)
Date#VC10k Area
09/09/20221VC37 - WorcestershireSO74
08/09/20221VC36 - HerefordshireSO55
08/09/20221VC36 - HerefordshireSO74
07/09/20222VC37 - WorcestershireSO97
07/09/20222VC36 - HerefordshireSO74

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