Species Account

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Summary Data

Season (Adult / Immature):

National Status: Common

Local Status: Fairly common and widespread resident.

Local Record: Grade 1   See here for explanation

Flight time: Two generations, Apr-Jun, Jul-Aug.

Forewing: 18-24mm.

Foodplant: Birch and Alder.

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 recorded1905200719821905
Year last recorded2011200720112011
Number of records155321733456
Number of individuals209465875374
Unique positions279120600
Unique locations199119438
Adult records140021723148
Immature records1002

For the region, we have a total of 3456 records from 438 sites. Earliest record on file is in 1905.


2000 Iron Prominent 03
© Will Bown
2000 Iron Prominent 02 larva
© Jenny Seawright
2000 Iron Prominent 01
© Tom Morris

Species Account

For further information refer UK Moths.

Davey, P., 2009: A species occurring throughout Britain, the larva feeding on alder (Alnus glutinosa), oak (Quercus spp.), birch (Betulae spp.) and hazel (Corylus avellana). In Dorset, the moth is primarily a denizen of old oak/birch woodland and birch on heathland, and in these habitats it is frequent. It is infrequent elsewhere and becomes rather rare in open tree-less habitat. The national norm is a single brood in northern Britain in June and July, and a double brood in the south. In Dorset, the flight period covers four months. This is suspected of comprising a single brood with a peak in early July, plus a double brood with peaks in mid-May and early August. In this latter cycle, the peak of the second brood is on average, two times larger than the peak of the first brood.

See background to species accounts.  Index of Vernacular names - Search - Random Species