Geometridae : Ennominae
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Photo © Martin Wood

Similar Dorset Species
August Thorn
Ennomos quercinaria
Dusky Thorn
Ennomos fuscantaria
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Canary-shouldered Thorn
Ennomos alniaria

(Linnaeus, 1758) 1913 / 70.234

Davey, P., 2009: A frequent species in Britain, the larva feeding on birch (Betula spp.), alder (Alnus spp.), sallow (Salix spp.), and a variety of other deciduous tree and shrub species. In Dorset, the moth is widespread and common to abundant in old deciduous woodland, particularly those with sizeable stocks of host foodplant.

Diagnostic: yellow thorax, so yellow that wasps often target and kill the moth as if it were a threat to them.

Recorded in 38 (95%) of 40 10k Squares.
First Recorded in 1934.
Last Recorded in 2019.
(Data up to end 2019)
Additional Stats

Forewing: 16-20mm
Flight: July - October
Foodplant:   Downy and Silver Birch, Alder, limes, elms
Red List: Least Concern (LC)
GB Status: Common
Verification Grade:  Adult: 1
< August Thorn  |  Dusky Thorn >
List Species Records   [Show All Latest]
Latest 5 Records (data up to end 2019)
Date#VC10k Area
27/10/201919SY98 Wareham
27/09/201919SY98 Wareham
25/09/201929SY88 Wool / Lulworth
25/09/201919SY78 Broadmayne
24/09/201959SY98 Wareham

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