Species Account

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Summary Data

Season (Adult / Immature):

National Status: Local

Local Status: Scarce and local resident.

Local Record: Grade 3   See here for explanation

Flight time: One generation, Jul-Sep.

Forewing: 18-22mm.

Foodplant: Pedunculate Oak and Sessile Oak.

IMPORTANT - Please note that the maps and accounts are provisional, subject to change and further update.  The whole dataset still needs to go through the final verification process and it is likely that a very small number of records will not satisfy the present requirements and there are other records that have not been formally submitted.  The information is for guidance only.

Record breakdown:

Year first recorded190519861905
Year last recorded201120012011
Number of records2193444
Number of individuals65731320
Unique positions693144
Unique locations642132
Adult records2153436
Immature records000

For the region, we have a total of 444 records from 132 sites. Earliest record on file is in 1905.


1912 August Thorn 01
© Dave Foot

Species Account

Similar species: 1914 Ennomos fuscantaria (Dusky Thorn) and 1915 Ennomos erosaria (September Thorn).

For further information refer UK Moths.

Davey, P., 2009: A local species in Briatain but absent from northern Scotland, the larva feeding on beech (Fagus spp.), blackthorn (Prunus spp.), oak (Quercus spp.), birch (Betula spp.), hawthorn (Crateagus spp.) and a variety of other deciduous tree and shrub species. In Dorset, the moth is most often found in deciduous woods, preferring woodland containing beech; elsewhere the moth is rarely encountered. The national norm is a single brood between mid-August and mid-September, but in Dorset the moth is on the wing from late-July in most years. In the hot summer of 1976, moths were on the wing as early as 5 July at Arne.

Care is needed in identifying the August Thorn as it may be mistaken for Dusky Thorn1914 or September Thorn1915. Diagnostics: inner line curves sharply inwards as it approaches the costal edge of the forewing; relatively slender abdomen.

Hill, L., 2013:

Further diagnostic: August Thorn has what have been described as long, white socks.

Last updated: 22 August 2013


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