Yponomeuta cagnagella       Yponomeuta plumbella
16.005 BF428  –  Yponomeutidae –  Yponomeutinae – Yponomeuta rorrella – Willow Ermine – (Hübner, 1796) Adult Micro:  CAT 2 – Confusion Species –       PDF Icon – click for General Verification Guidelines  |   PDF Icon – click for Specific Verification Guidelines
Green –  Rare / Uncommon / Scarce       orange – Migrant
Taxonomy:   Micro   >>  Yponomeutidae  >> Yponomeutinae
ID Difficulty:  Red – difficult to identify – detailed examination required, often a Gen Det and/or specimen and quality photographs are required.
Confusion Species: Orchard Ermine (Yponomeuta padella), Apple Ermine (Yponomeuta malinellus), Spindle Ermine (Yponomeuta cagnagella)
ID pointers: Difficult to ID as are the majority of the yponomeuta group, but longer and more narrow winged, with two toned white and grey forewings with black dots which are smaller in size than other yponomeuta. Mostly white in the dorsal half and in a thin line along the costa with a small white blotch along the costa near the apex which is contrasting against the grey rear third.
Distribution:  (Last record: 6 September 2024 at Long Eaton )  –  Not listed in Harrison & Sterling (1988) – Most probably a local species, and occasional migrant found where there is White Willow Salix alba and Grey Willow (S.cinerea) A huge migrant influx occurred in 2023
Flight Period: July /  August /  –  On the wing July – August Moth Activity: Nocturnal   – and is attracted to light Photographed: Yes –  Photographed By: Tony Davison  © All Rights Reserved
*** Last updated on 2 October 2025 by RP ***
Wingspan: 19-24mm
 Food Plant: Salix – White Willow & Grey Willow
Last Recorded Year: 2024
Last Recorded By – Marion Bryce
Last Recorded General Area – Long Eaton
Selected Images:  Melbourne, Derbyshire – Tony Davison ©

Yponomeuta rorrella - Tony Davison
Yponomeuta rorrella
Willow-Ermine - Tony Davison
Willow-Ermine – Tony Davison
Willow-Ermine - Tony Davison
Willow-Ermine – Tony Davison
Yponomeuta rorrella - Tony Davison
Willow-Ermine - Tony Davison
Willow-Ermine - Tony Davison

 
 

Image Gallery

No gallery images found for this moth.


 

Distribution Map for Yponomeuta rorrella

Found 132 records
    ↳ 10 from After 2025
    ↳ 105 from 2020 - 2024
    ↳ 17 from Before 2020
Flying
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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.

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.


NBN Atlas UK Distribution for – Yponomeuta rorrella

⚠️ 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: Yponomeuta rorrella
( data includes both Larvae and Adult Stages )

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


First/Last Recorded Dates: Yponomeuta rorrella
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: Yponomeuta rorrella
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Yponomeuta rorrella
AGR: 5.11%   |   Total % Change: 133.3%


CUSUM Analysis: Yponomeuta rorrella
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 8 (August) 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 2024, reaching above average levels. The lowest population point occurred near 2021, 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: Yponomeuta rorrella
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Yponomeuta rorrella
( 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 - Yponomeuta rorrella – 132 records available

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

Site NameTetradDateCountStageSource
Wingerworth, DerbyshireSK36Y15/08/20251adultvc57_irecords_extract
Melbourne, DerbyshireSK32X19/08/20251adultvc57_irecords_extract
Ilkeston, DerbyshireSK44K11/07/20258adultvc57_irecords_extract
Ilkeston, DerbyshireSK44K19/07/20256adultvc57_irecords_extract
Ilkeston, DerbyshireSK44K26/07/20251adultvc57_irecords_extract
upper cromford gardenSK25Y29/07/20251adultvc57_irecords_extract
Mickleover gardenSK33C04/07/20251adultvc57_irecords_extract
Mickleover gardenSK33C29/06/20251adultvc57_irecords_extract
Trent LockSK43V24/05/20251larval webvc57_irecords_extract
Glossop, Hague Street, Hay MeadowSK09G21/05/20251adultvc57_irecords_extract
West Park Fox Covert LNRSK43W06/09/20245adultvc57_irecords_extract
BelperSK34U03/08/20241adultvc57_irecords_extract
Mickleover gardenSK33C01/08/20242adultvc57_irecords_extract
Markham Vale DerbyshireSK47K09/08/20241adultvc57_irecords_extract
Ilkeston, DerbyshireSK44K10/08/20244adultvc57_irecords_extract
Chaddesden, DerbySK33T04/08/20241adultvc57_irecords_extract
Ilkeston, DerbyshireSK44K29/08/20241adultvc57_irecords_extract
Glossop, Gnat Hole Rough FieldsSK09L01/08/20241adultvc57_irecords_extract
Derbyshire Wild Life Trust Long CloughSK09G04/08/202420adultvc57_irecords_extract
Longdendale, Wildboar Clough WoodlandSK09U11/08/20241adultvc57_irecords_extract
Glossop, Hague Street, Hay meadowSK09G15/08/20241adultvc57_irecords_extract
Derbyshire Wild Life Trust Long CloughSK09G23/08/20244adultvc57_irecords_extract
Woodland AveSK43R02/08/202421adultvc57_irecords_extract
Woodland AveSK43R09/08/20241adultvc57_irecords_extract
Woodland AveSK43R16/08/20241adultvc57_irecords_extract
Woodland AveSK43R23/08/20241adultvc57_irecords_extract
Inkersall gardenSK47G20/07/20241adultvc57_irecords_extract
Melbourne, DerbyshireSK32X19/07/20245adultvc57_irecords_extract
Melbourne, DerbyshireSK32X23/07/20241adultvc57_irecords_extract
Scalpcliffe roadSK22R30/07/20244adultvc57_irecords_extract
Ilkeston, DerbyshireSK44K28/07/20248adultvc57_irecords_extract
Mickleover gardenSK33C29/07/202411adultvc57_irecords_extract
Mickleover gardenSK33C31/07/20243adultvc57_irecords_extract
Clover Close, ElvastonSK43B29/07/20241adultvc57_irecords_extract
Longdendale, Pasture WoodSK09U26/07/20241adultvc57_irecords_extract
Glossop, Hague Street, Hay meadowSK09G30/07/20242adultvc57_irecords_extract
Woodland AveSK43R27/07/20243adultvc57_irecords_extract
High Leas Farm, RiberSK35D28/07/20241adultvc57_irecords_extract
King's NewtonSK32Y29/07/20241098adultvc57_irecords_extract
Derby DESK33I31/07/20245adultvc57_irecords_extract
High Bridge GPSK22Y08/06/202410larvavc57_irecords_extract
Findern GardenSK33A01/09/20231Adultvc57_irecords_extract
Melbourne, DerbyshireSK32X11/08/202315adultvc57_irecords_extract
Markham Vale DerbyshireSK47L10/08/20233adultvc57_irecords_extract
Staveley DerbyshireSK47H11/08/20239adultvc57_irecords_extract
Staveley DerbyshireSK47H14/08/20233adultvc57_irecords_extract
Staveley DerbyshireSK47H23/08/20231adultvc57_irecords_extract
Melbourne, DerbyshireSK32X11/08/202312adultvc57_irecords_extract
Staunton Harold Reservoir, DerbyshireSK32S15/08/202315adultvc57_irecords_extract
Waingroves WoodsSK44E04/08/20239adultvc57_irecords_extract
Woodland AveSK43R06/08/20233adultvc57_irecords_extract
Woodland AveSK43R19/08/20237adultvc57_irecords_extract
Findern GardenSK33A04/08/202311Adultvc57_irecords_extract
Findern GardenSK33A10/08/20236Adultvc57_irecords_extract
Findern GardenSK33A11/08/20233Adultvc57_irecords_extract
Findern GardenSK33A16/08/20234Adultvc57_irecords_extract
Glossop, Moorfield, Wood's CabinSK09L03/08/20235adultvc57_irecords_extract
Glossop, Bray CloughSK09L09/08/20231adultvc57_irecords_extract
Glossop, Gnat Hole Rough FieldsSK09L19/08/20231adultvc57_irecords_extract
Glossop, Gnat Hole Rough FieldsSK09L21/08/20231adultvc57_irecords_extract
Woodland AveSK43R21/07/20237adultvc57_irecords_extract
Woodland AveSK43R28/07/202326adultvc57_irecords_extract
Findern GardenSK33A18/07/20232Adultvc57_irecords_extract
Findern GardenSK33A21/07/20235Adultvc57_irecords_extract
Findern GardenSK33A24/07/20232Adultvc57_irecords_extract
Findern GardenSK33A27/07/202360Adultvc57_irecords_extract
Findern GardenSK33A28/07/202310Adultvc57_irecords_extract
Mickleover gardenSK33C29/07/20231adultvc57_irecords_extract
Glossop, Moorfield, Wood's CabinSK09L19/07/20231adultvc57_irecords_extract
Woodland AveSK43R05/08/20221adultvc57_irecords_extract
Woodland AveSK43R26/08/20221adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A03/08/20221adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A08/08/20226adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A10/08/20222adultvc57_irecords_extract
Staveley DerbyshireSK47H19/07/20223adultvc57_irecords_extract
Staveley DerbyshireSK47H25/07/20221adultvc57_irecords_extract
Woodland AveSK43R16/07/20227Adultvc57_irecords_extract
Woodland AveSK43R19/07/202216Adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A08/07/20222adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A11/07/20221adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A17/07/20221adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A18/07/20221adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A29/07/20225adultvc57_irecords_extract
Kirk Hallam, IlkestonSK44K08/07/20222adultvc57_irecords_extract
Kirk Hallam, IlkestonSK44K17/07/20225adultvc57_irecords_extract
Kirk Hallam, IlkestonSK44K22/07/202220adultvc57_irecords_extract
Kirk Hallam, IlkestonSK44K29/07/202223adultvc57_irecords_extract
Woodland AveSK43R01/08/202113adultvc57_irecords_extract
Woodland AveSK43R08/08/20212adultvc57_irecords_extract
Woodland AveSK43R13/08/20212adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A02/08/20215adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A11/08/20211adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A20/08/20211adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A23/08/20211adultvc57_irecords_extract
Not givenSK33A09/07/20211Adultvc57_irecords_extract
Woodland AveSK43R18/07/20211adultvc57_irecords_extract
Woodland AveSK43R20/07/20212adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A09/07/20211adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A16/07/20211adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A19/07/20215adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A26/07/202117adultvc57_irecords_extract
Woodland AveSK43R06/08/20201adultvc57_irecords_extract
Melbourne, DerbyshireSK32X13/08/20201adultvc57_irecords_extract
Melbourne, DerbyshireSK32X20/08/20202adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A07/08/20206adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A11/08/20203adultvc57_irecords_extract
Woodland AveSK43R17/07/20202adultvc57_irecords_extract
Woodland AveSK43R21/07/20205adultvc57_irecords_extract
Woodland AveSK43R29/07/20204adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A17/07/20201adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A21/07/20202adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A28/07/20201adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A30/07/20203adultvc57_irecords_extract
Kirk Hallam, IlkestonSK44K31/07/20201adultvc57_irecords_extract
Wood Lane, Newhall, SwadlincoteSK22V17/07/20201adultDanes_2019-2021
Findern, Derbyshire, DEAZSK33A02/08/20193adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A07/08/20191adultvc57_irecords_extract
Findern, Derbyshire, DEAZSK33A26/07/20193adultvc57_irecords_extract
Main Street, Kings NewtonSK32Y18/07/20181Adultvc57_irecords_extract
Straw's Bridge, Ilkeston, Meadow near Sustrans Cycle TrackSK44K11/08/20161adultvc57_irecords_extract
Main Street, Kings NewtonSK32Y09/07/20151Adultvc57_irecords_extract
Main Street, Kings NewtonSK32Y06/08/20142Adultvc57_irecords_extract
Backgarden MarehaySK34Z03/08/20131adultvc57_irecords_extract
Backgarden MarehaySK34Z26/07/20133adultvc57_irecords_extract
Duffield Rd, Allestree, DerbySK34K15/07/20131Adultvc57_danes_bc_data
Main Street, Kings NewtonSK32Y19/08/20122Adultvc57_irecords_extract
Main St,Kings Newton,MelbourneSK32Y19/08/20121Adultvc57_danes_bc_data
Duffield Rd, Allestree, DerbySK34K27/07/20121Adultvc57_danes_bc_data
DovedaleSK15K01/08/20111Adultvc57_danes_bc_data
DovedaleSK15K01/08/20111Adultvc57_danes_bc_data
DovedaleSK15K01/08/20111Adultvc57_danes_bc_data
Robin Wood (central area)SK32M04/08/20081Adultvc57_danes_bc_data

 
Yponomeuta cagnagella       Yponomeuta plumbella

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