Geometridae : Larentiinae
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Photo © Ian Gamble,  Berkhampstead, Hertfordshire (24/07/19)

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Balsam Carpet
Xanthorhoe biriviata

(Borkhausen, 1794) 1721 / 70.050

General comments:
Extremely local resident and occasional immigrant

The Balsam Carpet was first discovered as British as recently as 1955 in the Colne Valley between Middlesex and Buckinghamshire. It is rarely but regularly found in the Colne Valley at places such as Maple Cross but it may now be extinct in Cassiobury Park, Watford; it should be looked for here and elsewhere. There may be unknown breeding sites, but occasional reports across the area are generally regarded to relate to either immigrants or, at best, vagrants from out-of-county sites.

Retained Specimen / Photograph will be Required.

Recorded in 10 (24%) of 41 10k Squares.
First Recorded in 1940.
Last Recorded in 2023.
Additional Stats

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List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
18/07/2023120SP91 - Tring
11/07/2022120TL11 - Harpenden / Wheathampstead
10/07/2022121TQ09 - Watford / Rickmansworth
07/07/2022120SP91 - Tring
03/07/2022120TL22 - Stevenage
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record Balsam Carpet
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 12-14mm.
Flight: Two Generations. Apr-Jun. Jul-Sep.
Foodplant:   Orange and Small Balsam
Red List: Least Concern (LC)
GB Status: Nationally Scarce
Verification Grade:  Adult: 3
 Immature Adult   [Show Flight Weeks]
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