Species Account

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Distribution


 
 

Summary Data


Season (Adult / Immature):

National Status: Local

Local Status: Uncommon and thinly distributed or restricted resident.

Local Record: Grade 2   See here for explanation

Flight time: Jun-Sep.

Forewing: 12-15mm.

Foodplant: Various brassicas.

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:

 VC9VC11Region
Year first recorded195620031956
Year last recorded201020062010
Number of records972198
Number of individuals1072218
Unique positions26256
Unique locations23250
Adult records952194
Immature records000

For the region, we have a total of 198 records from 50 sites. Earliest record on file is in 1956.
 

Photos


1357 Evergestis extimalis 01
© Jean Southworth, 18 Jul 2012

Species Account


For further information refer UK Moths.

Davey, P., 2009: A rare species in Britain confined to the Breck district and along the Thames estuary, the larva feeding on the seeds of charlock (Sinapis arvensis) and white mustard (Sinapis alba) in the Breck, and the seeds of perennial wall-rocket (Diplotaxis tenuifolia), along the Thames estuary. In Dorset, the moth has been recorded in all but one of the past seventeen years, but there are no records prior to 1987. With the exception of singletons from Puddletown and Gaunts Common, all examples have been from the coastal fringe, and most have coincided with immigration events. The status of the moth is therefore a regular but infrequent immigrant.

The national norm is a single-brood in June and July, but the Dorset records suggest two broods, the first in June, and a much larger second brood between early-August and mid-September. This bivoltine pattern is more a reflection of the cycle abroad rather than that experienced in the UK. Both charlock and white mustard ‘arable weeds’, have declined considerably in response to the widespread use of herbicides, and consequently there appears to be little scope for this species to gain a permanent foothold in the county.
 

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