35.053 Isophrictis striatella ([Denis & Schiffermüller], 1775)

Status and Distribution

Local in central, southern and eastern England and the Channel Islands becoming very local in the rest of England. Rare in Wales and there is a single and extremely isolated record from Scotland, near Aberdeen in 1973. Not recorded from Ireland, Northern Ireland or Isle of Man.

National Status: 

Nationally Scarce B

Bradley & Fletcher no: 

729
Photo courtesy of UK Moths.
Photographer: Patrick Clement
Location: Halesowen, W Midlands

Provisional Map

Maps updated with all data received by February 2016.

    Imago

    Isophrictis striatella (Photo: O Wadsworth)  Isophrictis striatella (Photo: P Clement)  Isophrictis striatella (Photo: ukleps)

    Larva

    Isophrictis striatella larva (Photo: P Clement)

    Dissection Group

    Foodplant and Larval Feeding Signs

    Tanacetum vulgare (tansy), see plant distribution map, and Achillea ptarmica (sneezewort). In Europe, also found on Pyrethrum corymbosum and Anthemis (Cota) tinctoria.

    During the feeding stage the minute hole used by a larva to access seedheads are difficult to see. In October the larval overwintering site in the stem or flowerhead is accessed via a larger hole filled with whitish chewed pith (see photo).

     striatella feeding

    Foodplant Map

    Habitat

    Isophrictis striatella habitat Southsea June 2013 (Photo: S M Palmer)

    Grassy places such as waste ground, road verges, riversides, railway embankments and gardens, when associated with tansy. Those utilising sneezewort occur in damper locations such as marshes, fens, water meadows, rush pasture marshes and stream-sides.

    Finding the Moth

    Larva: feeds in flower-heads in late August to October and later over-winters in the stem (upper part) or seed-head. Pupates in June in its overwintering site or amongst debris on the ground.

    Adult: can be found on the flower-heads or swept from amongst the food-plants. Flies at night and comes to light.

    Similar Species

    Fresh specimens are unlikely to be confused with any other species.

    Larval Occurrence

    Larval Occurrence

    Flight Period

    Flight Period

    Single brooded in July and August.

    Earliest: 29th June 2004 (VC17)

    Latest: 31st August 1998 (VC32)