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15.005 BF283  – Birch Stilt  – Caloptilia betulicola  – (Hering, 1928)
Adult Micro:  CAT 4 – Dissection 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
Green –  Rare / Uncommon / Scarce        purple – Leaf-miner
Taxonomy:   Micro   >>  Gracillariidae  >> Gracillariinae
Other Name/s: Red Birch Slender
ID Difficulty:  amber  – care required in the identification process, as confusion with similar species is likely – quality photographs required.
Confusion Species:  Caloptilia elongella (Alder Stilt) Caloptilia rufipennella (Rufous Stilt)
ID pointers: Another plain orange-brown Caloptilia and easily confused with C. elongella, with variable darker markings of orange or brown on the forewing.
Distribution:  (Last record: 5 March 2025 at Breaston )  –  Generally uncommon with only a few records – maybe under recorded and should perhaps be more reported due to amount of Birch in the recording area.
General Comment: None
Flight Period: June /  July /  September /  October –  Two generations, June – July and September- October when it hibernates reappearing the following spring Mine Period:  July /  September /  November
Mine Period Additional: The larvae mine the leaves of Birch then in a folded or rolled up leaf
Mine ID Difficulty: Not Recorded
Mine Type/s: Not Recorded
Mine Feeding Method/s: Not Recorded
Mine Comment: None.
Moth Activity: Cathemeral  Photographed: No –  Photographed By: Not Recorded
*** Last updated on 2 October 2025 by RP ***
Wingspan: 14-16mm
Food Plant: Birch
Last Recorded Year: 2022
Last Recorded By – Steve Thorpe
Last Recorded General Area – Breaston

Selected Images:  



Temporal Distribution Chart
Adults: (between 1994 - 2025)  |  Immatures: (between 2010 - 2018)
(click legend below to show/hide datasets)

Distribution Map for Caloptilia betulicola

Found 12 records
    ↳ from 2026+
    ↳ 3 from 2020 - 2025
    ↳ 9 from Before 2020
Flying
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Mining
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 – Caloptilia betulicola

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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.

Visit NBN Site


Monthly Records By Year: Caloptilia betulicola
( data includes both Larvae and Adult Stages )

Monthly Counts By Year: Caloptilia betulicola
( data is based on 'Adult' stage records only )

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

Hectad (10kmx10km) Coverage: Caloptilia betulicola
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Caloptilia betulicola

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.

Mine Periods – Indicative –vs– Recorded Data
Caloptilia betulicola
( 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 2020-2026.

Records Behind the Map and Charts - Caloptilia betulicola – 12 records available

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

Site NameTetradDateCountStageRecorderSourceRecordKey
Lightwood, BuxtonSK07M24/11/20251adultOrridge, Stevevc57_irecords_extractiBRC48148155
Woodland AveSK43R19/07/20221AdultThorpe, Stevevc57_irecords_extractiBRC27846513
Woodland AveSK43R17/06/20221AdultThorpe, Stevevc57_irecords_extractiBRC27846426
Millstone EdgeSK28K17/08/20181LarvaWatchorn, Andrewvc57_irecords_extractiBRC7770362
Longshaw Estate and Padley GorgeSK27P18/07/20171LarvaWatchorn, Andrewvc57_irecords_extractiBRC5467155
Blacka Moor and PlantationSK28V27/06/20151LarvaWatchorn, Andrewvc57_irecords_extractiBRC13278101
Allestree Park, Allestree, DerbySK33P14/03/20141AdultDave Budworthvc57_danes_bc_dataLC000334001CP9IA
Backgarden MarehaySK34Z20/04/20131adultThorpe, Stevevc57_irecords_extractiBRC34052916
Slippery Stones,Upper DerwentSK19S25/08/20101Larval MineS.H. Hindvc57_danes_bc_dataLC000334001COXI3
Padley Gorge, Nether PadleySK27P19/08/20101Larval MineS.H. Hindvc57_danes_bc_dataLC000334001CP6HH
Edgecote Drive,Newhall,SwadlincoteSK22V30/07/20041AdultTopliss, Neilvc57_danes_bc_dataLC000334001COVOQ
Crich Chase, Ambergate (site not precise)SK35L16/04/19941AdultVC57 Derbyshire Recordervc57_danes_bc_dataLC000334001CP129

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