Geometridae : Ennominae
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Photo © Ben Sale,  Stevenage, Hertfordshire (21/07/20)

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September Thorn
Ennomos erosaria

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

General comments:
Extremely local resident.

The September Thorn has never been especially numerous in the two counties, though it is present in a reasonable number of sites in the south of Herts and the north of Middlesex. It has certainly been lost from a number of sites, as the map indicates; this should be interpreted in the light of 91 per cent population decline, nationally, since 1970.

Recorded in 29 (71%) of 41 10k Squares.
First Recorded in 1905.
Last Recorded in 2023.
Additional Stats

< Dusky Thorn  |  Early Thorn >

List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
15/09/2023121TQ27 - Hammersmith / Westminster
10/09/2023120SP90 - Berkhamsted
10/09/2023120TL31 - Hertford
07/09/2023120TL21 - Welwyn Garden City
06/09/2023121TQ28 - Hendon / Hampstead / Camden
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record September Thorn
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 17-21mm.
Flight: One generation July-Oct.
Foodplant:   Oaks and birches limes, Beech
Red List: Near Threatened (NT)
GB Status: Common
BAP Status: Declining (Research only)
Verification Grade:  Adult: 2
 Immature Adult   [Show Flight Weeks]
© hertsmiddxmoths.uk 2024 NOLA®; Database using MapMate® Digital Maps © Bartholomew 2010. Design © Jim Wheeler 2024
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