Species Account

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Summary Data

Season (Adult / Immature):

National Status: pRDB3

Local Status: Scarce and thinly distributed and restricted resident.

Local Record: Grade 3   See here for explanation

Flight time: Jul-Aug.

Forewing: 12mm.

Foodplant: Various sedges.

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 recorded18851885
Year last recorded20102010
Number of records4284
Number of individuals4896
Unique positions3774
Unique locations3366
Adult records2550
Immature records00

For the region, we have a total of 84 records from 66 sites. Earliest record on file is in 1885.


1296 Crambus silvella 02
© M Parsons/Butterfly Conservation
1296 Crambus silvella 01
© Peter Davey

Species Account

For further information refer UK Moths.

Davey, P., 2009: A rare species restricted to bogs in south-east Britain, the larva feeding on sedges (Carex spp.). In Dorset, the moth is confined exclusively to mire habitat where it is at low density; it is on the wing at the height of the summer between mid-July and mid-August. Three sedge species tend to be present in the vicinity of colonies. These are: common yellow sedge (Carex viridula oedocarpa), carnation sedge (Carex panicea) and star sedge (Carex echinata).

The following light trap records indicate dispersal on occasion: Wyke Regis, on 6 August 2006 (D Foot), Puddletown, on 18 July 2005 (H Wood Homer). Conservation agencies who manage sites containing mire habitat, for example, Morden Bog and Hartland Moor (Natural England) and Parley Heath (Herpetological Conservation Trust) should include this species in their management plans.

This species is similar to Crambus pascuella1294. Diagnostics include: the long and short white streak on the forewing are shorter and longer, respectively, than those in Crambus pascuella; the white streaks do not overlap across the width of the wing.


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