Cnephasia stephensiana       Cnephasia pasiuana
49.051 BF1021  –  Tortricidae –  Tortricinae – Cnephasia asseclana – Flax Tortrix – ([Denis & Schiffermüller], 1775) Adult Micro:  CAT 4 – Gen. Det. Required – Gen-Det-Reqd       Leaf-miner:  CAT L – The leaf or a Photo required – reared and possibly dissected       PDF Icon – click for General Verification Guidelines  |   PDF Icon – click for Specific Verification Guidelines
Blue –  Generally Common / Widespread        purple – Leaf Miner
Taxonomy:   Micro   >>  Tortricidae  >> Tortricinae
Other Name/s: interjectana
ID Difficulty:  amber  – care required in the identification process, as confusion with similar species is likely – quality photographs required.
Confusion Species:  other Cnephasia
ID pointers: The ID of Graham’s specimen was determined by Gen.Det but no prep photos were taken. Variable in markings, this particular one shows overall brown forewings covered in spots and blotches. Can show variegated cross-bands over a paler brown background. A Gen Det prep photo by the late Claire Miles is of one taken on 7th June 2022.
Distribution:  A reasonably common species found in gardens, farmland and other open spaces, but due to the difficulty of identification, records remain low. Can be confused with other Cnephasia. If uncertain please record as Cnephasia agg
Flight Period: June /  July /  August /  –  On the wing during June-August.  – Considered a Leaf miner as the larvae initially mine the leaves of its host plants. Then later spinning the leaves or flowers together for pupation. Moth Activity: Nocturnal   – and is attracted to light Photographed: Yes –  Photographed By: Graham Finch  © All Rights Reserved
*** Last updated on 7 May 2025 by RP ***
Wingspan: 15-18mm
 Food Plant: Wide range of herbaceous plants
Recorded dates for Common [Blue code Blue-coded] moths are not stored on the website at this current time.
IMAGES BELOW:  Grange Wood, Derbyshire – Graham Finch©

Cnephasia asseclana - Graham Finch
Cnephasia asseclana – Graham Finch
Cnephasia asseclana - 7th June 2022 - Hathersage - Gen Det - The late Claire Miles
7th June 2022 – Hathersage – Gen Det – The late Claire Miles
Cnephasia asseclana - Graham Finch
Cnephasia asseclana - 7th June 2022 - Hathersage - Gen Det - The late Claire Miles

no images were found

Distribution Map for Cnephasia asseclana

Found 18 records
    ↳ 2 from After 2025
    ↳ 1 from 2020 - 2024
    ↳ 15 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 – Cnephasia asseclana

⚠️ 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: Cnephasia asseclana
( data includes both Larvae and Adult Stages )

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


First/Last Recorded Dates: Cnephasia asseclana
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: Cnephasia asseclana
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Cnephasia asseclana
AGR: 0%   |   Total % Change: 0%


CUSUM Analysis: Cnephasia asseclana
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 16 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 2007, reaching above average levels. The lowest population point occurred near 2004, 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: Cnephasia asseclana
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Cnephasia asseclana
( 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.

Mine Periods – Indicative –vs– Recorded Data
Cnephasia asseclana
( data includes both Larvae and Adult Stages )

Mine 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 mine periods [month/s]. The coloured lines represent the actual months seen mining, from site observation records received between 2020-2025.

Records Behind the Map and Charts - Cnephasia asseclana – 18 records available

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

TaxonSite NameTetradYearDateCountStageSource
Cnephasia asseclanaShaw Farm, New Mills VCSJ98Y202512/08/20251adultvc57_irecords_extract
Cnephasia asseclanaIngleby Ave, DerbySK33L202520/06/20251adultvc57_irecords_extract
Cnephasia asseclanaHathersage, Derbyshire, UKSK28F202207/06/20221adultvc57_irecords_extract
Cnephasia asseclanaMidway Rd,Midway,SwadlincoteSK32A201313/07/20131Adultvc57_danes_bc_data
Cnephasia asseclanaBamford St,RipleySK34Z201215/07/20121Adultvc57_danes_bc_data
Cnephasia asseclanaRosliston (National Forest Centre), SwadlincoteSK21N201220/07/20126Adultvc57_danes_bc_data
Cnephasia asseclanaBamford St,RipleySK34Z201219/06/20121Adultvc57_danes_bc_data
Cnephasia asseclanaBamford St,RipleySK34Z201217/06/20121Adultvc57_danes_bc_data
Cnephasia asseclanaDenefields,MatlockSK36A201022/07/20101Adultvc57_danes_bc_data
Cnephasia asseclanaNewboundmill Lane,PleasleySK56C200913/06/20091Adultvc57_danes_bc_data
Cnephasia asseclanaDrakelow NR (car park),Burton on TrentSK22F200812/07/20081Adultvc57_danes_bc_data
Cnephasia asseclanaDrakelow NR (car park),Burton on TrentSK22F200828/06/20081Adultvc57_danes_bc_data
Cnephasia asseclanaCarvers Rocks,Hartshorne,Swadlincote (old toilet block area)SK32G200711/08/20076Adultvc57_danes_bc_data
Cnephasia asseclanaShipley Park (Cinder Hill), Shipley, IlkestonSK44H200502/07/20051Adultvc57_danes_bc_data
Cnephasia asseclanaMain St,Kings Newton,MelbourneSK32Y200513/07/20051Adultvc57_danes_bc_data
Cnephasia asseclanaForemark Resr, TicknallSK32H200509/07/20056Adultvc57_danes_bc_data
Cnephasia asseclanaEdgecote Drive,Newhall,SwadlincoteSK22V200403/07/20041Adultvc57_danes_bc_data
Cnephasia asseclanaDowey Lumb NR, DronfieldSK38Q199725/07/19971Adultvc57_danes_bc_data

Cnephasia stephensiana       Cnephasia pasiuana

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