Species Account

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Summary Data

Season (Adult / Immature):

National Status: Common

Local Status: Scarce and local resident.

Local Record: Grade 2   See here for explanation

Flight time: Two generations, May-Jun, Aug-Sep.

Forewing: 19-22mm.

Foodplant: St John's-worts.

IMPORTANT - Please note that the maps and accounts are provisional, subject to change and further update.  The whole dataset still needs to go through the final verification process and it is likely that a very small number of records will not satisfy the present requirements and there are other records that have not been formally submitted.  The information is for guidance only.

Record breakdown:

Year first recorded195519931955
Year last recorded201120112011
Number of records2547522
Number of individuals3557724
Unique positions635136
Unique locations595128
Adult records2477508
Immature records000

For the region, we have a total of 522 records from 128 sites. Earliest record on file is in 1955.


1867 Treble-bar 03
© Will Bown, Jun 2013
1867 Treble-bar 02
© Dave Foot
1867 Treble-bar 01
© Tom Morris

Species Account

Similar species: 1868 Lesser Treble-bar Aplocera efformata.

For further information refer UK Moths.

Davey, P., 2009: A widespread species in Britain, the larva feeding on st. john's-wort (Hypericum spp.). In Dorset, the moth has been observed, seldom commonly, where st. john's-wort grows in abundance, across the five distinct habitat types below. Both this and the next species are easily flushed from their foodplants during the day.

1 Dry grassland containing perforate st john's-wort (Hypericum perforatum)
2 Dry woodland rides on chalky soil containing perforate st john's-wort and hairy st john's-wort (Hypericum hirsutum)
3 Dry woodland rides on sandy soil containing perforate st john's-wort, slender st john's-wort (Hypericum pulchrum) and trailing st john's-wort (Hypericum humifusum)
4 Wet woodland, rivers, marshes and ditches containing square-stalked st john's-wort (Hypericum tetrapterum)
5 Pools, bogs, acid streamlets and ditches and old claypits containing marsh st john's-wort (Hypericum tetrapterum).

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