Species Details

ABH: 70.012

BF: 1711

Family: Geometridae

Subfamily: Sterrhinae

Taxon: Idaea trigeminata

Authority: (Haworth, 1809)

Vernacular: Treble Brown Spot

Account: Local in woodland rides, gardens and hedgerows, and on chalk downland throughout southern England. Possible confusion species include f. fimbriolata of Small Fan-footed Wave I. biselata, and Single-dotted Wave I. dimidiata, which see. Larva feeds on withered leaves of Ivy.

Accounts provided by and used with the kind permission of Mike Wall, Hampshire County Moth Recorder. These will in due course be gradually replaced with species accounts with a Surrey context.

Wingspan: 23 — 25 mm

Surrey Flight Period: 15 May (2007) — 16 Oct (2025)

The flight period of overwintering adults are not given. See the flight chart below the distribution map.

Foodplant: Hedera sp., Polygonum aviculare (Knotgrass), Polyphagous.

Foodplant accounts are from the HOSTS database — Natural History Museum, London, UK. (CC0).

Status: Least Concern (LC)

UK BAP:

WCA:

Click here to view the full geology map of Surrey.

Verification Grade: 2 — Care needed to identify, an image may be required 🤔
Further Information: https://www.ukmoths.org.uk/species/idaea-trigeminata/
Statistics

* Based on adult records only.

Records: 886

Individuals: 1478

Earliest Year: 1924

Latest Year: 2025

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