Geometridae : Larentiinae
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Treble-bar
Aplocera plagiata

(Linnaeus, 1758) 1867 / 70.192
Photo © Damian Money,  Upton, Norfolk

Similar Yorkshire Species
Lesser Treble-bar
Aplocera efformata
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Express Record Treble-bar

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Yorkshire Status: Local resident.

Separating Treble-bar and Lesser Treble-bar is not the easiest task if you are not familiar with both species, in fact they were considered to be the same species until 1923. The angulation of the basal cross band is often mentioned as a distinguishing feature but this is tricky and not really reliable. A better way (as long as you have got a male) is to look at the tip of the abdomen. The longer claspers of Treble-bar give it a more pointed appearance. See the pictures on page 134 of the third edition of the Field Guide. This is by far the least common of the two species though it can the the commonest in the north and west of the county and it is also regularly encountered in the east of VC63. The other feature is that it is larger than Lesser Treble-bar. Both of these species are bivoltine in Yorkshire and both feed on St John's Worts (Hypericum sp). We hope that the distribution maps are accurate but you can never be quite sure with these two species!

Sutton & Beaumont, 1989: A rather local species, mostly confined to the high ground in the north and west of the County.

Recorded in 64 (32%) of 200 10k Squares.
First Recorded in 1886.
Last Recorded in 2023.
Additional Stats

< Manchester Treble-bar  |  Lesser Treble-bar >
Forewing: 19-22mm.
Flight: May - June and August - September
Foodplant:   St John's-worts.
Red List Status: Least Concern (LC)
GB Status: Common
Verification Grade:  Adult: 2
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
16/09/2023163SE61 - Stainforth / Thorne
06/09/2023163SK59 - Maltby
20/08/2023262SE39 - Northallerton
16/08/2023263SE41 - South Elmsall
07/08/2023162SE56 - Easingwold (S)
  Immature   Adult   [Show Flight Weeks]
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
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