Key action species

This species has been identified in the Threatened Species Recovery Actions - 2025 Baseline, published by Natural England, as having key actions which can help recover populations or prevent further loss.

View actions

Silky Wave

Idaea dilutaria

(Hübner, [1799])

National assessment

Unassessed

Local assessment

Unassessed

Associated assemblage

open short sward 177 other species in this assemblage

Statistics

Occurrences

1 since 2000 1 all time

Occupied 1 km squares

1 since 2000 1 all time

Earliest occurrence

2019

Latest occurrence

2019

Distribution

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If you've seen this species and want to report a sighting, head over to iRecord. If you're able to provide more context on the status in Greater Lincolnshire, habitat requirements or other information get in touch.

Occurrence since 1950

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This chart should not be relied upon for an indication of species status as variations in recording effort can heavily affect the count of occurrences and occupied 1km squares.

Threatened species recovery actions

Actions from Threatened Species Recovery Actions 2025 Baseline published by Natural England.

Habitat management

Clear secondary woodland from additional areas of the Avon Gorge; monitor development of limestone grassland habitat and colonisation by Silky Wave.

Habitat management

Silky Wave requires periodic scrub clearance to maintain sites in good condition for the moth. Ensure known subsites in the Avon Gorge are managed appropriately, through rotational scrub clearance and/or grazing.

Scientific research

The main larval host plant is thought to be Common Rock-rose (Helianthemum nummularium). However, subsites on the south side of the Avon Gorge have little or no Helianthemum present and the moth is likely to be using alternative host plant(s). Conduct larval surveys to determine the host plants used at these subsites.

Untargeted habitat management

This species would benefit from untargeted habitat management to increase habitat mosaics, structural diversity, or particular successional stages

References

Webb, J., Heaver, D., Lott, D., Dean, H.J., van Breda, J., Curson, J., Harvey, M.C., Gurney, M., Roy, D.B., van Breda, A., Drake, M., Alexander, K.N.A. and Foster, G. (2017). Pantheon. [online] Available at: http://www.brc.ac.uk [05/02/2025].

Wilkins, T.C., Baker, T.G, Hipperson-Jervis, C. and Thompson, M. (2025). Threatened Species Recovery Actions 2025 Baseline Version 1.1 - Spreadsheet. Joint Publication JP065. Natural England and partners, UK. https://publications.naturalengland.org.uk/publication/6106216194113536

Data sources

Local species recorders

Cite this page

GLNP (2025). Idaea dilutaria (Hübner, [1799]) species profile, in Greater Lincolnshire Nature Partnership (ed.) Greater Lincolnshire species data bank. Available at: http://glincsson.glnp.org.uk/view?taxon_list_item_key=NBNORG0000058356 (Accessed 09 November 2025).