Species Account

Select species and region:



Summary Data

Season (Adult / Immature):

National Status: Local

Local Status: Rare and local resident.

Local Record: Grade 3   See here for explanation

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

Forewing: 12-14mm.

Foodplant: Downy Birch, Silver Birch.

Regional breakdown:

Year first recorded1940190418831883
Year last recorded2014201420142012
Number of records4433512
Number of individuals3731841
Unique positions2823242
Unique locations2217232
Adult records3727502
Immature records1200

For the county, we have a total of 130 records from 64 sites. First recorded in 1883.


70.032 Birch Mocha 04
© Dave Williamson
70.032 Birch Mocha 03
© Andy Nunn
70.032 Birch Mocha 02
© Dave Williamson
70.032 Birch Mocha 01
© Terry Box, 7 Jun 2011

Species Account

Sutton & Beaumont, 1989: There have been one or two additional localities reported as well as further confirmation of the new localities from the 1970 list (YNU, 1970).

2012 (CHF): Still very local in birch woodland, mostly in the centre of the county. The majority of our records come from lowland heaths.

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