Eucosma cana       Eucosma fulvana
49.266 BF1200  –  Tortricidae –  Olethreutinae – Eucosma hohenwartiana – Common Knapweed Tortrix – (Denis & Schiffermüller, 1775) Adult Micro:  CAT 2 – Confusion Species –       PDF Icon – click for General Verification Guidelines  |   PDF Icon – click for Specific Verification Guidelines
Black – Uncertain/Unknown – Insufficient Data   
Taxonomy:   Micro   >>  Tortricidae  >> Olethreutinae
Other Name/s: Bright Bell
ID Difficulty:  amber  – care required in the identification process, as confusion with similar species is likely – quality photographs required.
Confusion Species:  E. cana
ID pointers: Forewing greyish-brown to reddish-brown, with pale brownish white, often along the costa. A pale greyish white or brownish-white dorsal blotch.
Distribution:  (Last record: 15 June 2025 at Cromford )  –  Uncertain – Likely to be widespread and locally common where there are knapweeds. A scattering of records across the county.
Flight Period: June /  July /  August /  –  On the wing during June – August. Moth Activity: Nocturnal  Crepuscular   – and is attracted to light Photographed: Yes –  Photographed By: Steve Orridge. Nikki Mahadevan, Clive Ashton   © All Rights Reserved
*** Last updated on 26 July 2025 by TD ***
Wingspan: 15-22mm
 Food Plant: Knapweed (Centaurea), Saw-wort (Serratula).
Last Recorded Year: 2025
Last Recorded By – Clive Ashton
Last Recorded General Area – Cromford
IMAGES BELOW:  Buxton, Derbyshire – Steve Orridge© / Jim Mart NR – Nikki Mahadevan© / Cromford (2025) Clive Ashton©

Eucosma hohenwartiana - Buxton - Steve Orridge
Eucosma hohenwartiana – Buxton – Steve Orridge
Eucosma hohenwartiana - 24th June 2023 - Jim Mart NR - Nikki Mahadevan
Eucosma hohenwartiana – 24th June 2023 – Jim Mart NR – Nikki Mahadevan
Eucosma hohenwartiana 15th June 2025 - Cromford - Clive Ashton
Eucosma hohenwartiana 15th June 2025 – Cromford – Clive Ashton
Eucosma hohenwartiana - Buxton - Steve Orridge
Eucosma hohenwartiana - 24th June 2023 - Jim Mart NR - Nikki Mahadevan
Eucosma hohenwartiana 15th June 2025 - Cromford - Clive Ashton

no images were found

Distribution Map for Eucosma hohenwartiana

Found 50 records
    ↳ 3 from After 2025
    ↳ 13 from 2020 - 2024
    ↳ 34 from Before 2020

If the Map Layers function fails, just refresh the page and it should be OK after. Use the +- zoom on the top left, or on a tablet, use two fingers to zoom. Remember, the last layer you ticked is the one which displays the popup information - they sit on top of each other - de-select then re-select, to see the popup values.

******* Choose ONLY one at a time, of either Monad, Tetrad or Hectad Distribution - each has it's own set of data. Also, the distribution maps cover ALL recorded data. *******

Bedrock Geology ** indirectly affects moth distribution by influencing the type of habitat and food plants available in an area. In turn, this may affect the types of moths that can thrive, or where they can most likely be found.

Land-cover * shows the variety of land-cover within the VC57 area, based on the CORINE (Coordination of Information on the Environment) forty-four thematic classes of land-cover. This will show, to a greater or lesser degree, the number and variety of moths found in different land-cover types. The UK continues to operate within the Copernicus programme, with the UK Centre for Ecology & Hydrology (UKCEH) providing Corine Land Cover (CLC) datasets for the UK and its territories.


NBN Atlas UK Distribution for – Eucosma hohenwartiana

⚠️ Please wait for the map to load fully – do not click the link shown.


Note – the NBN Atlas datasets are listed in the map below and vary in their currency (uptodateness) – however, the map does give a general indication of the moth's distribution across the UK.

Visit NBN Site


Monthly Records By Year: Eucosma hohenwartiana
( data includes both Larvae and Adult Stages )

Monthly Counts By Year: Eucosma hohenwartiana
( data is based on 'Adult' stage records only. )


First/Last Recorded Dates: Eucosma hohenwartiana
Adult-only & Anything [Larvae, Pupae, Adult, Mines]

Shading shows moth presence between dates

Click the colour discs below to Select/De-select as Required

Recordings By Year: Eucosma hohenwartiana
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Eucosma hohenwartiana
AGR: -0.86%   |   Total % Change: -16.7%


CUSUM Analysis: Eucosma hohenwartiana
About this chart: CUSUM (Cumulative Sum) charts track long-term trends in moth populations [ filtered by 'Adult' and 'Mine' life stages ] by showing whether each year’s counts are above or below the historical average. Even small shifts build up over time, making trends of growth, stability, or decline easier to see. CUSUM highlights trend-consistency — asking: “Across the years, have moth counts mostly stayed above or below average?”
The data sample has 11 gap year/s here (zero records) between 2000 and 2025. The moth may have been present in those gap years, but no data was available. Too many year-gaps may exaggerate or skew the chart.

Counts for the current year (2025) are pro-rated based on data available up to month 7 (July) to provide a full-year equivalent.

ⓘ Purple line rises = years better than average; falls = years worse than average.
Peak (best year) Trough (worst year) Growth periods Decline periods
Population peaked around 2010, reaching above average levels. The lowest population point occurred near 2009, showing a significant decline.

What the Y-axis "Cumulative Deviation" means: Cumulative Deviation shows the running total of how each year’s moth population count differs from the long-term average. i

Hectad (10kmx10km) Coverage: Eucosma hohenwartiana
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Eucosma hohenwartiana
( data includes Adult Stage only )

Flight Period chart – the grey hatched area above, which can cross one or more months, pictorially represents the best guess we have for this moth's flight periods [month/s]. The coloured lines represent the actual months seen in flight, from site observation records received between 2020-2025.

Records Behind the Map and Charts - Eucosma hohenwartiana – 50 records available

Listed by Year - descending - scroll across to see all table columns

TaxonSite NameTetradYearDateCountStageSource
Eucosma hohenwartianaStaveley garden SYASK47H202516/07/20251adultvc57_irecords_extract
Eucosma hohenwartianaMarkham Vale South TipSK47K202517/07/20252adultvc57_irecords_extract
Eucosma hohenwartianasheffieldSK38K202525/07/20252adultvc57_irecords_extract
Eucosma hohenwartianaInkersall gardenSK47G202427/07/20241adultvc57_irecords_extract
Eucosma hohenwartianaGreenfields BuxworthSK08G202408/07/20242adultvc57_irecords_extract
Eucosma hohenwartianaCoombs DaleSK27C202429/07/20241adultvc57_irecords_extract
Eucosma hohenwartianaupper cromford gardenSK25Y202426/06/20241adultvc57_irecords_extract
Eucosma hohenwartianaLadycroft AveSK07S202305/09/20231adultvc57_irecords_extract
Eucosma hohenwartianaMarkham Vale DerbyshireSK47L202305/07/20231adultvc57_irecords_extract
Eucosma hohenwartianaJim Mart Nature ReserveSK36S202324/06/20231Adultvc57_irecords_extract
Eucosma hohenwartianaLadycroft Ave, BuxtonSK07S202328/06/20231adultvc57_irecords_extract
Eucosma hohenwartianaMeynell LangleySK23Z202202/07/20221adultvc57_irecords_extract
Eucosma hohenwartianaUK, Derbyshire, Lathkill DaleSK16T202201/07/20221adultvc57_irecords_extract
Eucosma hohenwartianaHathersage, Derbyshire, UKSK28F202102/07/20212adultvc57_irecords_extract
Eucosma hohenwartianaEtherow CP ()SJ99Q202020/07/20202not recordedvc57_irecords_extract
Eucosma hohenwartianaWaterswallows QuarrySK07X202017/07/20201not recordedvc57_irecords_extract
Eucosma hohenwartianaLocko Plantation, PilsleySK46G201604/07/20161adultvc57_irecords_extract
Eucosma hohenwartianaJim Mart Nature ReserveSK36S201422/07/20141Adultvc57_irecords_extract
Eucosma hohenwartianaLadycroft AveSK07S201302/08/20131adultvc57_irecords_extract
Eucosma hohenwartianaBackgarden MarehaySK34Z201212/07/20121adultvc57_irecords_extract
Eucosma hohenwartianaBamford St,RipleySK34Z201212/07/20121Adultvc57_danes_bc_data
Eucosma hohenwartianaRowthorne Trail NR, PleasleySK46W201221/07/20121Adultvc57_danes_bc_data
Eucosma hohenwartianaDovedaleSK15K201101/08/20112Adultvc57_danes_bc_data
Eucosma hohenwartianaDovedaleSK15K201101/08/20111Adultvc57_danes_bc_data
Eucosma hohenwartianaDovedaleSK15K201111/07/20111Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201006/07/201032Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201006/07/201021Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201006/07/201023Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201006/07/201016Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201028/07/20102Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201028/07/20103Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201028/07/20101Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201006/07/201021Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201006/07/201010Adultvc57_danes_bc_data
Eucosma hohenwartianaMilldale, HartingtonSK15M201006/07/20109Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201028/07/20104Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201028/07/20107Adultvc57_danes_bc_data
Eucosma hohenwartianaBiggin Dale, nr HartingtonSK15P201028/07/20101Adultvc57_danes_bc_data
Eucosma hohenwartianaDovedaleSK15K200905/07/20091Adultvc57_danes_bc_data
Eucosma hohenwartianaDovedaleSK15K200905/07/20091Adultvc57_danes_bc_data
Eucosma hohenwartianaDovedaleSK15K200914/06/20091Adultvc57_danes_bc_data
Eucosma hohenwartianaMelbourne, DerbyshireSK32X200722/07/20071adultvc57_irecords_extract
Eucosma hohenwartianaSpinney Hill,MelbourneSK32X200722/07/20071Adultvc57_danes_bc_data
Eucosma hohenwartianaChurch St,Holloway,MatlockSK35I200517/07/20051Adultvc57_danes_bc_data
Eucosma hohenwartianaBonsall MoorSK25T200419/07/20042Adultvc57_danes_bc_data
Eucosma hohenwartianaDowey Lumb NR, DronfieldSK38Q199725/07/19971Adultvc57_danes_bc_data
Eucosma hohenwartianaCunning Dale, Buxton (site not precise)SK07W199707/07/19971Adultvc57_danes_bc_data
Eucosma hohenwartianaThe Shimmers, Cressbrook, BuxtonSK17R199620/07/19961Adultvc57_danes_bc_data
Eucosma hohenwartianaCressbrook Dale, Little LongstoneSK17R199620/07/19961Adultvc57_danes_bc_data
Eucosma hohenwartianaRowsley Sidings, Rowsley (site not precise)SK26S199404/07/19941Adultvc57_danes_bc_data

Eucosma cana       Eucosma fulvana

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