Geometridae : Ennominae
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Photo © Ben Sale,  Stevenage, Hertfordshire (22/07/18)

Similar Herts & Middlesex Species
Large Thorn
Ennomos autumnaria
Canary-shouldered Thorn
Ennomos alniaria
Dusky Thorn
Ennomos fuscantaria
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August Thorn
Ennomos quercinaria

(Hufnagel, 1767) 1912 / 70.233

General comments:
Widespread but local resident.

Has become widespread in occurrence across the area from about 2013 onwards, though mostly in the west of Hertfordshire, where it is not infrequently caught. Elsewhere it is scarce but is possibly extending its range.

Recorded in 30 (73%) of 41 10k Squares.
First Recorded in 1887.
Last Recorded in 2023.
Additional Stats

< Large Thorn  |  Canary-shouldered Thorn >

List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
17/09/2023120SP91 - Tring
08/09/2023220TL10 - St Albans
06/09/2023220SP91 - Tring
05/09/2023120TL10 - St Albans
03/09/2023220SP91 - Tring
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record August Thorn
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 18-22mm.
Flight: One generation Aug-Sept.
Foodplant:   Pedunculate Oak and Sessile Oak
Red List: Least Concern (LC)
GB Status: Common
BAP Status: Declining (Research only)
Former Status: Local
Verification Grade:  Adult: 1
 Immature Adult   [Show Flight Weeks]
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