Geometridae : Ennominae
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Photo © George Fowler,  Broxbourne, Hertfordshire (29/07/22) - Showing Underside

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Large Thorn
Ennomos autumnaria
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Dusky Thorn
Ennomos fuscantaria

(Haworth, 1809) 1914 / 70.235

General comments:
Widespread resident.

We are told that there has been a national population decline of 98 per cent since 1970. In our area, numbers of individuals have declined since about the 1980s, but there is no evidence of it vanishing from any known sites.

Recorded in 34 (83%) of 41 10k Squares.
First Recorded in 1887.
Last Recorded in 2023.
Additional Stats

< Canary-shouldered Thorn | September Thorn >

List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
25/09/2023120TL42 - Bishop's Stortford (N)
23/09/2023120TL31 - Hertford
20/09/2023120TL30 - Hoddesdon / Cheshunt
17/09/2023120TL30 - Hoddesdon / Cheshunt
17/09/2023120TL31 - Hertford
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 17-21mm.
Flight: One generation July-Oct.
Foodplant:   Ash
Red List: Near Threatened (NT)
GB Status: Common
BAP Status: Declining (Research only)
Verification Grade:  Adult: 1
 Immature Adult   [Show Flight Weeks]
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