Geometridae : Ennominae
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Dusky Thorn
Ennomos fuscantaria

(Haworth, 1809) 1914 / 70.235
Photo © Nancy Stedman,  SE006466 High Farnhill, VC64

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Similar Yorkshire Species: None
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Yorkshire Status: Uncommon and fairly widespread resident.

Sutton & Beaumont, 1989: Widely distributed and sometimes locally common in an area for a few years. Many populations seem to either be transitory or subject to large variation in numbers.

2012 (CHF): In the Rothamsted data this species had declined by 98% between 1968 and 2002 making it the moth with the biggest drop in numbers. This seems to have been most marked in the south and numbers in Yorkshire were doing fairly well until 2009 when records dropped by a significant amount. This species may be prone to major fluctuations and it is interesting that Porritt regarded it as generally scarce in 1883 which he altered to local but not uncommon in 1907. Records are currently spread all across the county with the exception of the far west.

Recorded in 140 (70%) of 200 10k Squares.
First Recorded in 1883.
Last Recorded in 2022.
Additional Stats

< Canary-shouldered Thorn  |  September Thorn >
Forewing: 17-21mm
Flight: July - October
Foodplant:   Ash
Red List Status: Near Threatened (NT)
GB Status: Common
BAP Status: Declining Species (BAP R)
Verification Grade:  Adult: 1
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
18/10/2022162NZ61 - Guisborough
29/09/2022161SE92 - Swanland
23/09/2022164SE54 - York (S/W)
22/09/2022261TA05 - Driffield
22/09/2022163SK69 - New Rossington / Austerfield
  Immature   Adult
Show Details | 1990 to 2022 | 2000 to 2022 | Graph Key
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