Species Account

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Summary Data

Season (Adult / Immature):

National Status: Nb

Local Status: Scarce and very local resident.

Local Record: Grade 3   See here for explanation

Flight time: One generation, Jun-Jul.

Forewing: 11-13mm.

Foodplant: Sea-beet.

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 recorded188719941887
Year last recorded201120092011
Number of records11113248
Number of individuals26725584
Unique positions42798
Unique locations34884
Adult records11012244
Immature records000

For the region, we have a total of 248 records from 84 sites. Earliest record on file is in 1887.


1691 Rosy Wave 03
© Martin Cade, 29 Jun 2009
1691 Rosy Wave 02
© Martin Cade, 6 Aug 2011
1691 Rosy Wave 01
© David Kingman

Species Account

For further information refer UK Moths.

Davey, P., 2009: A local and mainly coastal species in England, the larva feeding on beet (Beta vulgaris). In Dorset, this moth is a denizen of mire and saltern habitat rather than of coast. Relatively strong colonies occupy muddy shores and saltmarsh edges in Poole Harbour and Christchurch Harbour and in mire habitat across the Poole Basin. No colonies have yet been detected west of the Poole Basin which is rather surprising given beet's strictly maritime distribution and the plant's relative abundance along Dorset's coastal belt. However, larvae have been noted on a range of plant species on the Continent. The moth is attracted to light, but an easier way to locate the species, providing that access to mire colonies is possible, is to observe them at sunset as they rest close to the vegetation canopy, often at the top of purple moor-grass stems, before they take to the wing. The national norm is a single brood in late June and July; however, a partial second generation from mid-August to late September is suggested by the limited data available; multiple broods occur in southern Europe. The following light trap records are suspected wanderers from colonies in the Poole basin: Church Ope Cove, on 25 June 1988 (JEC), Puddletown, on 16 July 2003 (H Wood Homer), Scar Bank, two on 14 July 1934 (A Russell). Many of the existing localities hosting the species are on SSSIs, so threats to the species in Dorset are considered minimal providing conservation agencies keep water tables high enough to maintain the host mire habitat at the respective sites.

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