Yponomeuta rorrella - Tony Davison
16.005 BF428  – Willow Ermine  – Yponomeuta rorrella  – (Hübner, 1796)
Adult Micro:  CAT 2 – Can be confused with other 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
General Comment: None
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 ©

 
 


Temporal Distribution Chart
Adults: (between 2008 - 2025)  |  Immatures: (between 2024 - 2025)
(click legend below to show/hide datasets)
This chart summarises all available historical occurrence records collated by ISO week of the year. It reflects recorder effort and sampling distribution as well as true biological activity, and should be interpreted as an indicative pattern of seasonal occurrence rather than a statistically controlled abundance or phenology model.

 

Distribution Map for Yponomeuta rorrella

Found 141 records
    ↳ from 2026+
    ↳ 124 from 2020 - 2025
    ↳ 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

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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.

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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: 7.52%   |   Total % Change: 242.9%

Hectad (10kmx10km) Coverage: Yponomeuta rorrella
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Yponomeuta rorrella

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 2020-2026.

Records Behind the Map and Charts - Yponomeuta rorrella – 141 records available

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

Site Name Tetrad Date Count Stage Recorder Source RecordKey
Melbourne, Derbyshire SK32X 19/08/2025 1 adult Davison, Tony vc57_irecords_extract iBRC44610644
Wingerworth, Derbyshire SK36Y 15/08/2025 1 adult Windle, Jim vc57_irecords_extract iBRC44474571
Sheffield SK38M 03/08/2025 1 adult Turner, Jan vc57_irecords_extract iBRC44459495
upper cromford garden SK25Y 29/07/2025 1 adult Ashton, Clive vc57_irecords_extract iBRC44038700
King's Newton SK32Y 29/07/2025 12 adult Soar, Will vc57_irecords_extract iBRC48470352
King's Newton SK32Y 27/07/2025 4 adult Soar, Will vc57_irecords_extract iBRC48469887
Ilkeston, Derbyshire SK44K 26/07/2025 1 adult Hobby, Brian vc57_irecords_extract iBRC43958782
Ilkeston, Derbyshire SK44K 19/07/2025 6 adult Hobby, Brian vc57_irecords_extract iBRC43957856
Ilkeston, Derbyshire SK44K 11/07/2025 8 adult Hobby, Brian vc57_irecords_extract iBRC43602522
Woodland Ave SK43R 05/07/2025 9 adult Thorpe, Steve vc57_irecords_extract iBRC48391243
Mickleover garden SK33C 04/07/2025 1 adult Maughan, Christine vc57_irecords_extract iBRC44890054
Mickleover garden SK33C 29/06/2025 1 adult Maughan, Christine vc57_irecords_extract iBRC43910751
Woodland Ave SK43R 27/06/2025 1 adult Thorpe, Steve vc57_irecords_extract iBRC48391161
Barrow upon Trent, Derbyshire SK32J 11/06/2025 1 larval web TOM SHIELDS vc57_irecords_extract iBRC42208168
Trent Lock SK43V 24/05/2025 1 larval web Neil Gregory vc57_irecords_extract iBRC41787217
Glossop, Hague Street, Hay Meadow SK09G 21/05/2025 1 adult Heintzen, Christian vc57_irecords_extract iBRC43979277
West Park Fox Covert LNR SK43W 06/09/2024 5 adult Bryce, Marion vc57_irecords_extract iBRC38352030
Ilkeston, Derbyshire SK44K 29/08/2024 1 adult Hobby, Brian vc57_irecords_extract iBRC38375586
Derbyshire Wild Life Trust Long Clough SK09G 23/08/2024 4 adult Heintzen, Christian vc57_irecords_extract iBRC38473386
Woodland Ave SK43R 23/08/2024 1 adult Thorpe, Steve vc57_irecords_extract iBRC40045326
Woodland Ave SK43R 16/08/2024 1 adult Thorpe, Steve vc57_irecords_extract iBRC40045232
Glossop, Hague Street, Hay meadow SK09G 15/08/2024 1 adult Heintzen, Christian vc57_irecords_extract iBRC38473229
Longdendale, Wildboar Clough Woodland SK09U 11/08/2024 1 adult Heintzen, Christian vc57_irecords_extract iBRC38473181
Ilkeston, Derbyshire SK44K 10/08/2024 4 adult Hobby, Brian vc57_irecords_extract iBRC37911227
Woodland Ave SK43R 09/08/2024 1 adult Thorpe, Steve vc57_irecords_extract iBRC40045188
Markham Vale Derbyshire SK47K 09/08/2024 1 adult Morris, Sid vc57_irecords_extract iBRC37840527
Derbyshire Wild Life Trust Long Clough SK09G 04/08/2024 20 adult Heintzen, Christian vc57_irecords_extract iBRC38472846
Chaddesden, Derby SK33T 04/08/2024 1 adult roome, martin vc57_irecords_extract iBRC38328156
Belper SK34U 03/08/2024 1 adult Evans, Dave vc57_irecords_extract iBRC37669209
Woodland Ave SK43R 02/08/2024 21 adult Thorpe, Steve vc57_irecords_extract iBRC40045142
Glossop, Gnat Hole Rough Fields SK09L 01/08/2024 1 adult Heintzen, Christian vc57_irecords_extract iBRC38472640
Mickleover garden SK33C 01/08/2024 2 adult Maughan, Christine vc57_irecords_extract iBRC37701447
Mickleover garden SK33C 31/07/2024 3 adult Maughan, Christine vc57_irecords_extract iBRC37701262
Derby DE SK33I 31/07/2024 5 adult Watson, Adrian vc57_irecords_extract iBRC43688851
Glossop, Hague Street, Hay meadow SK09G 30/07/2024 2 adult Heintzen, Christian vc57_irecords_extract iBRC38130911
Scalpcliffe road SK22R 30/07/2024 4 adult Ward, Clive vc57_irecords_extract iBRC37582261
King's Newton SK32Y 29/07/2024 1098 adult Soar, Will vc57_irecords_extract iBRC40386614
Mickleover garden SK33C 29/07/2024 11 adult Maughan, Christine vc57_irecords_extract iBRC37700685
Clover Close, Elvaston SK43B 29/07/2024 1 adult Bryce, Marion vc57_irecords_extract iBRC38104434
High Leas Farm, Riber SK35D 28/07/2024 1 adult Thorpe, Steve vc57_irecords_extract iBRC40045058
Ilkeston, Derbyshire SK44K 28/07/2024 8 adult Hobby, Brian vc57_irecords_extract iBRC37608972
Woodland Ave SK43R 27/07/2024 3 adult Thorpe, Steve vc57_irecords_extract iBRC40044935
Longdendale, Pasture Wood SK09U 26/07/2024 1 adult Heintzen, Christian vc57_irecords_extract iBRC38130769
Melbourne, Derbyshire SK32X 23/07/2024 1 adult Davison, Tony vc57_irecords_extract iBRC37309848
Inkersall garden SK47G 20/07/2024 1 adult Cambridge, Don vc57_irecords_extract iBRC37184393
Melbourne, Derbyshire SK32X 19/07/2024 5 adult Davison, Tony vc57_irecords_extract iBRC37199781
High Bridge GP SK22Y 08/06/2024 10 larva Winspear, Richard vc57_irecords_extract iBRC38666725
Findern Garden SK33A 01/09/2023 1 Adult Hallam, Brian vc57_irecords_extract iBRC34638589
Staveley Derbyshire SK47H 23/08/2023 1 adult Morris, Sid vc57_irecords_extract iBRC32622204
Glossop, Gnat Hole Rough Fields SK09L 21/08/2023 1 adult Heintzen, Christian vc57_irecords_extract iBRC36337389
Glossop, Gnat Hole Rough Fields SK09L 19/08/2023 1 adult Heintzen, Christian vc57_irecords_extract iBRC36337348
Woodland Ave SK43R 19/08/2023 7 adult Thorpe, Steve vc57_irecords_extract iBRC33497112
Findern Garden SK33A 16/08/2023 4 Adult Hallam, Brian vc57_irecords_extract iBRC34638583
Staunton Harold Reservoir, Derbyshire SK32S 15/08/2023 15 adult Davison, Tony vc57_irecords_extract iBRC33088275
Staveley Derbyshire SK47H 14/08/2023 3 adult Morris, Sid vc57_irecords_extract iBRC32464400
Melbourne, Derbyshire SK32X 11/08/2023 15 adult Davison, Tony vc57_irecords_extract iBRC32375047
Melbourne, Derbyshire SK32X 11/08/2023 12 adult Davison, Tony vc57_irecords_extract iBRC33042181
Findern Garden SK33A 11/08/2023 3 Adult Hallam, Brian vc57_irecords_extract iBRC34638581
Kirk Hallam, Ilkeston SK44K 11/08/2023 7 adult Hobby, Brian vc57_irecords_extract iBRC48691018
Staveley Derbyshire SK47H 11/08/2023 9 adult Morris, Sid vc57_irecords_extract iBRC32410805
Findern Garden SK33A 10/08/2023 6 Adult Hallam, Brian vc57_irecords_extract iBRC34638572
Markham Vale Derbyshire SK47L 10/08/2023 3 adult Morris, Sid vc57_irecords_extract iBRC32410414
Glossop, Bray Clough SK09L 09/08/2023 1 adult Heintzen, Christian vc57_irecords_extract iBRC36337147
Woodland Ave SK43R 06/08/2023 3 adult Thorpe, Steve vc57_irecords_extract iBRC33496986
Findern Garden SK33A 04/08/2023 11 Adult Hallam, Brian vc57_irecords_extract iBRC34638567
Waingroves Woods SK44E 04/08/2023 9 adult Thorpe, Steve vc57_irecords_extract iBRC33496948
Kirk Hallam, Ilkeston SK44K 04/08/2023 5 adult Hobby, Brian vc57_irecords_extract iBRC48690992
Glossop, Moorfield, Wood's Cabin SK09L 03/08/2023 5 adult Heintzen, Christian vc57_irecords_extract iBRC36337032
Mickleover garden SK33C 29/07/2023 1 adult Maughan, Christine vc57_irecords_extract iBRC35945183
Findern Garden SK33A 28/07/2023 10 Adult Hallam, Brian vc57_irecords_extract iBRC34638565
Woodland Ave SK43R 28/07/2023 26 adult Thorpe, Steve vc57_irecords_extract iBRC33496884
Kirk Hallam, Ilkeston SK44K 28/07/2023 2 adult Hobby, Brian vc57_irecords_extract iBRC48690965
Findern Garden SK33A 27/07/2023 60 Adult Hallam, Brian vc57_irecords_extract iBRC34638564
Findern Garden SK33A 24/07/2023 2 Adult Hallam, Brian vc57_irecords_extract iBRC34638556
Findern Garden SK33A 21/07/2023 5 Adult Hallam, Brian vc57_irecords_extract iBRC34638547
Woodland Ave SK43R 21/07/2023 7 adult Thorpe, Steve vc57_irecords_extract iBRC33496805
Glossop, Moorfield, Wood's Cabin SK09L 19/07/2023 1 adult Heintzen, Christian vc57_irecords_extract iBRC36336762
Findern Garden SK33A 18/07/2023 2 Adult Hallam, Brian vc57_irecords_extract iBRC34638538
Woodland Ave SK43R 26/08/2022 1 adult Thorpe, Steve vc57_irecords_extract iBRC33495252
Findern, Derbyshire, DEAZ SK33A 10/08/2022 2 adult Brian and Jean Hallam vc57_irecords_extract iBRC35167514
Findern, Derbyshire, DEAZ SK33A 08/08/2022 6 adult Brian and Jean Hallam vc57_irecords_extract iBRC35167479
Woodland Ave SK43R 05/08/2022 1 adult Thorpe, Steve vc57_irecords_extract iBRC33495113
Findern, Derbyshire, DEAZ SK33A 03/08/2022 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35167423
Findern, Derbyshire, DEAZ SK33A 29/07/2022 5 adult Brian and Jean Hallam vc57_irecords_extract iBRC35167329
Kirk Hallam, Ilkeston SK44K 29/07/2022 23 adult Hobby, Brian vc57_irecords_extract iBRC41046066
Staveley Derbyshire SK47H 25/07/2022 1 adult Morris, Sid vc57_irecords_extract iBRC27287046
Kirk Hallam, Ilkeston SK44K 22/07/2022 20 adult Hobby, Brian vc57_irecords_extract iBRC41046013
Woodland Ave SK43R 19/07/2022 16 Adult Thorpe, Steve vc57_irecords_extract iBRC27846306
Staveley Derbyshire SK47H 19/07/2022 3 adult Morris, Sid vc57_irecords_extract iBRC27109745
Findern, Derbyshire, DEAZ SK33A 18/07/2022 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35167202
Findern, Derbyshire, DEAZ SK33A 17/07/2022 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35167112
Kirk Hallam, Ilkeston SK44K 17/07/2022 5 adult Hobby, Brian vc57_irecords_extract iBRC41045940
Woodland Ave SK43R 16/07/2022 7 Adult Thorpe, Steve vc57_irecords_extract iBRC27846171
Findern, Derbyshire, DEAZ SK33A 11/07/2022 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35166986
Findern, Derbyshire, DEAZ SK33A 08/07/2022 2 adult Brian and Jean Hallam vc57_irecords_extract iBRC35166939
Kirk Hallam, Ilkeston SK44K 08/07/2022 2 adult Hobby, Brian vc57_irecords_extract iBRC41045907
Findern, Derbyshire, DEAZ SK33A 23/08/2021 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35165780
Findern, Derbyshire, DEAZ SK33A 20/08/2021 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35165725
Woodland Ave SK43R 13/08/2021 2 adult Thorpe, Steve vc57_irecords_extract iBRC33499297
Findern, Derbyshire, DEAZ SK33A 11/08/2021 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35165629
Woodland Ave SK43R 08/08/2021 2 adult Thorpe, Steve vc57_irecords_extract iBRC33499234
Findern, Derbyshire, DEAZ SK33A 02/08/2021 5 adult Brian and Jean Hallam vc57_irecords_extract iBRC35165556
Woodland Ave SK43R 01/08/2021 13 adult Thorpe, Steve vc57_irecords_extract iBRC33499189
Findern, Derbyshire, DEAZ SK33A 26/07/2021 17 adult Brian and Jean Hallam vc57_irecords_extract iBRC35165492
Woodland Ave SK43R 20/07/2021 2 adult Thorpe, Steve vc57_irecords_extract iBRC33499031
Findern, Derbyshire, DEAZ SK33A 19/07/2021 5 adult Brian and Jean Hallam vc57_irecords_extract iBRC35165381
Woodland Ave SK43R 18/07/2021 1 adult Thorpe, Steve vc57_irecords_extract iBRC33498900
Findern, Derbyshire, DEAZ SK33A 16/07/2021 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35165312
Not given SK33A 09/07/2021 1 Adult Hallam, Brian vc57_irecords_extract iBRC20992989
Findern, Derbyshire, DEAZ SK33A 09/07/2021 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35165139
Melbourne, Derbyshire SK32X 20/08/2020 2 adult Davison, Tony vc57_irecords_extract iBRC33559833
Melbourne, Derbyshire SK32X 13/08/2020 1 adult Davison, Tony vc57_irecords_extract iBRC33559750
Findern, Derbyshire, DEAZ SK33A 11/08/2020 3 adult Brian and Jean Hallam vc57_irecords_extract iBRC35163695
Findern, Derbyshire, DEAZ SK33A 07/08/2020 6 adult Brian and Jean Hallam vc57_irecords_extract iBRC35163571
Woodland Ave SK43R 06/08/2020 1 adult Thorpe, Steve vc57_irecords_extract iBRC33501973
Kirk Hallam, Ilkeston SK44K 31/07/2020 1 adult Hobby, Brian vc57_irecords_extract iBRC41040548
Findern, Derbyshire, DEAZ SK33A 30/07/2020 3 adult Brian and Jean Hallam vc57_irecords_extract iBRC35163402
Woodland Ave SK43R 29/07/2020 4 adult Thorpe, Steve vc57_irecords_extract iBRC33501795
Findern, Derbyshire, DEAZ SK33A 28/07/2020 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35163370
Findern, Derbyshire, DEAZ SK33A 21/07/2020 2 adult Brian and Jean Hallam vc57_irecords_extract iBRC35163278
Woodland Ave SK43R 21/07/2020 5 adult Thorpe, Steve vc57_irecords_extract iBRC33501645
Wood Lane, Newhall, Swadlincote SK22V 17/07/2020 1 adult BUDWORTH, Mr D. Danes_2019-2021 542
Findern, Derbyshire, DEAZ SK33A 17/07/2020 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35163238
Woodland Ave SK43R 17/07/2020 2 adult Thorpe, Steve vc57_irecords_extract iBRC33501578
Findern, Derbyshire, DEAZ SK33A 07/08/2019 1 adult Brian and Jean Hallam vc57_irecords_extract iBRC35161748
Findern, Derbyshire, DEAZ SK33A 02/08/2019 3 adult Brian and Jean Hallam vc57_irecords_extract iBRC35161705
Findern, Derbyshire, DEAZ SK33A 26/07/2019 3 adult Brian and Jean Hallam vc57_irecords_extract iBRC35161633
Main Street, Kings Newton SK32Y 18/07/2018 1 Adult Soar, Will vc57_irecords_extract iBRC34059853
Straw's Bridge, Ilkeston, Meadow near Sustrans Cycle Track SK44K 11/08/2016 1 adult Bryce, Marion vc57_irecords_extract iBRC3859118
Main Street, Kings Newton SK32Y 09/07/2015 1 Adult Soar, Will vc57_irecords_extract iBRC34059854
Main Street, Kings Newton SK32Y 06/08/2014 2 Adult Soar, Will vc57_irecords_extract iBRC34680848
Backgarden Marehay SK34Z 03/08/2013 1 adult Thorpe, Steve vc57_irecords_extract iBRC33509390
Backgarden Marehay SK34Z 26/07/2013 3 adult Thorpe, Steve vc57_irecords_extract iBRC33508899
Duffield Rd, Allestree, Derby SK34K 15/07/2013 1 Adult P. Smith vc57_danes_bc_data LC000334001COYNT
Main Street, Kings Newton SK32Y 19/08/2012 2 Adult Soar, Will vc57_irecords_extract iBRC34680847
Main St,Kings Newton,Melbourne SK32Y 19/08/2012 1 Adult Soar, Will vc57_danes_bc_data LC000334001COYG5
Duffield Rd, Allestree, Derby SK34K 27/07/2012 1 Adult P. Smith vc57_danes_bc_data LC000334001CP899
Dovedale SK15K 01/08/2011 1 Adult D. Grundy vc57_danes_bc_data LC000334001COU1S
Dovedale SK15K 01/08/2011 1 Adult D. Grundy vc57_danes_bc_data LC000334001COU2I
Dovedale SK15K 01/08/2011 1 Adult D. Grundy vc57_danes_bc_data LC000334001CP9TD
Robin Wood (central area) SK32M 04/08/2008 1 Adult Dave Budworth;P. Patrick;W. Soar vc57_danes_bc_data LC000334001CP4IF

 
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