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Treble Brown Spot
Idaea trigeminata (Haworth, 1809)
Geometridae: Sterrhinae
1711 / 70.012
Photo © Susan Weeks,  09/06/2020 - Old Catton

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Similar Species
Small Fan-footed Wave
Idaea biselata
Single-dotted Wave
Idaea dimidiata
Forewing: 10-11mm.
Flight: Two Generations. May-Jul. Jul-Sep.
Foodplant:   Various plants, including Knotgrass and Ivy
Red List: Least Concern (LC)
GB Status: Common
Former Status: Local
Verification Grade:  Adult: 1
Status
Fairly common.
Woodland edges, hedgerows and gardens.

Recorded in 66 (89%) of 74 10k Squares.
First Recorded in 1873.
Last Recorded in 2025.
Additional Stats
Latest 10 Records
Date#VC10kArea
12/07/2025127TG31Acle
10/07/2025127TG30Blofield / Lingwood
09/07/2025127TG14Kelling Heath
08/07/2025+27TG41Filby
05/07/2025127TG20Norwich (Thorpe Hamlet)
05/07/2025127TG23North Walsham
05/07/2025+27TG41Filby
03/07/2025128TF63Heacham
03/07/2025427TG23North Walsham
02/07/2025127TG23North Walsham
Further info: Idaea trigeminata
 
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