Species Account

Select species and region:



Summary Data

Season (Adult / Immature):

National Status: Local

Local Status: Scarce and restricted resident.

Local Record: Grade 2   See here for explanation

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

Forewing: 12-14mm.

Foodplant: Downy Birch, Silver Birch.

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 recorded193519831935
Year last recorded201120112011
Number of records8571251964
Number of individuals15912313644
Unique positions15415338
Unique locations10614240
Adult records8301231906
Immature records000

For the region, we have a total of 1964 records from 240 sites. Earliest record on file is in 1935.


Birch Mocha 5
© Julian Francis
1677 Birch Mocha 04
© Julian Francis
1677 Birch Mocha 03
© Julian Francis
1677 Birch Mocha 02
© David Kingman
1677 Birch Mocha 01
© Tom Morris

Species Account

For further information refer UK Moths.

Davey, P., 2009: A widespread species in Britain, the larva feeding on birch (Betula spp.). In Dorset, the moth is common local amongst birch on sandy soil; typical localities include Arne Wood, Hurn and Holt Heath. It also occurs in woodland on chalky soil in the north-east of the county where birch is frequent, but here it is at a lower density. The dearth of records from west Dorset may be due to smaller numbers of birch trees in this region. The peak of the second brood is, on average, twice as large as that of the first brood.

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