Geometridae : Geometrinae
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Grass Emerald
Pseudoterpna pruinata

(Walker, 1863) 1665 / 70.297
Photo © Mike Pearson, 7 Jul 2010,  Flamborough, VC61

Immature stages

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Similar Yorkshire Species: None
Express Record Grass Emerald

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Yorkshire Status: Scarce and local resident.

This gorse and broom-feeding species is in decline over much of the country and has been lost from many of its old haunts. It was "not uncommon" according to Porritt in 1883 but seems to have declined substantially after Sutton and Beaumont was written in 1989, and there were few records in the 1990s. Formerly not uncommon in the Harrogate District, the last record was in 1991. Since then however it has made a modest recovery in some areas but is still very local in the county. It is seen in small numbers - over 90% of our records are of single moths. Like many green moths, it tends to fade and lose its green colour.

Sutton & Beaumont, 1989: There have been several more reports of this species since the last list (YNU, 1970). Whether these were spurred by the comment 'there are surprisingly few records', or whether there has been a genuine increase, is difficult to ascertain. However it probably occurs wherever gorse or broom is established and the moth has probably been overlooked in the past (SMJ pers. comm.).

Recorded in 63 (32%) of 200 10k Squares.
First Recorded in 1883.
Last Recorded in 2023.
Additional Stats

< Grass Wave  |  Large Emerald >
Forewing: 14-19mm
Flight: June - July
Foodplant:   Gorse, Broom
Red List Status: Least Concern (LC)
GB Status: Common
Verification Grade:  Adult: 1
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
28/07/2023162SE66 - Strensall
21/07/2023263SK69 - New Rossington / Austerfield
05/07/2023161TA17 - Bempton
03/08/2022163SK69 - New Rossington / Austerfield
26/07/2022163SE20 - Penistone
  Immature   Adult   [Show Flight Weeks]
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
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