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
Photographer: ©O Wadsworth

Provisional Map

Maps updated with all data received by January 2022.

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)