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Treble Brown Spot
Idaea trigeminata (Haworth, 1809)
Geometridae: Sterrhinae
1711 / 70.012
Photo © Damian Money,  Upton, Norfolk

Similar Yorkshire Species
Single-dotted Wave
Idaea dimidiata
Small Fan-footed Wave
Idaea biselata
Forewing: 10-11mm
Flight: Two Generations. May - July, July - September
Foodplant:   Various plants, including Knotgrass and Ivy
Red List: Least Concern (LC)
GB Status: Common
Former Status: Local
Verification Grade:  Adult: 2

Yorkshire Status: Scarce wanderer, probably in the process of becoming resident.

This southern species has been doing well in recent years and is slowly moving north so it was no great surprise when one was found at Spurn on 17/6/2022. A second moth was found the following year a little further down the peninsula. It is likely that this is the precursor to colonisation so it will be interesting to follow the progress. Take care not to confuse it with the much commoner and widespread Single-dotted Wave.

Recorded in 2 (1%) of 200 10k Squares.
First Recorded in 2022.
Last Recorded in 2023.
Additional Stats

Latest 5 Records
Date#VC10k Area
26/06/2023161TA41 - Kilnsea / Spurn Head
17/06/2022161TA31 - Skeffling / Easington
Further info: Idaea trigeminata
UK Moths
Mothdissection UK Yorkshire Moths (Full)
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