35.0299 Helcystogramma triannulella (Herrich-Schaffer, 1854)

Status and Distribution

Only two British records, from the Isles of Scilly in October 2013. Both were of individual females, on the 3rd October on St. Marys, caught at light by Dr. Chris Lewis and on 6th October on St. Agnes, again at light, by Dave Grundy). Probably arrived as migrants during a period of strong migratory activity.

Bradley & Fletcher no: 

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Provisional Map

Maps updated with all data received by February 2016.

    Imago

    Helcystogramma triannulella St Agnes, October 2013, (photo: D Grundy)

    Dissection Group

    Foodplant and Larval Feeding Signs

    There has been no indication yet that the species is breeding in Britain.

    In Europe the larva have been found on Calystegia sepium (hedge bindweed), Convolvulus arvensis (field bindweed) and on an unidentified Ipomoea sp. (morning glories) where it feeds within a folded leaf making opaque windows in two broods between May and September.

    Habitat

    Hedgerows

    Finding the Moth

    Larva: searches for folded leaves with opaque windows from May to September on the Isles of Scilly and south-west British coastal areas would be worthwhile.

    Adult: comes to light.

    Similar Species

    Similar in shape to the two other British Helcystogramma species (H. lutatella and H. rufescens) but with narrower, more obviously streaked forewings containing three black spots surrounded, more or less, with white scaling.

    Larval Occurrence

    Larval Occurrence

    Flight Period

    Flight Period

    Only recorded to date as a probable migrant in October. In Europe it has two broods, from June to August and from September overwintering as an adult to May.