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Caloptilia betulicola
Birch Stilt (Hering, 1927)
Gracillariidae: Gracillariinae
283 / 15.005
Photo © Stewart Wright,  28/08/2019 - Crostwight Common

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Similar Species
Alder Stilt
Caloptilia elongella
Rufous Stilt
Caloptilia rufipennella
Wingspan: 14-16mm
Flight: Two Generations. June-July. Sep. Overwintering to reappear in spring.
Foodplant:   Birch.
Nat Status: Common
Verification Grade:  Adult: 4  Mine: L
Status
Local.
Very similar to C. elongella, separated with certainty only by dissection of the genitalia. The two species were not recognised as separate in this country until the 1940s (Brown, 1947)

Unicolorous forms are similar to C. elongella, while well marked forms with yellow are similar to C. hemidactylella and will require dissection.

Leaf-mine: July, September - early November
larva mines the leaves initially and then living inside a rolled leaf. (compare with C. populetorum, which makes longtudinal rolls.)

Determination by Genitalia Examination Required

Mine: Either the leaf or a good photograph required

Recorded in 25 (34%) of 74 10k Squares.
First Recorded in 1986.
Last Recorded in 2024.
Additional Stats

Latest 10 Records
Date#VC10kArea
10/07/2024228TL99Merton
09/06/2024128TL99Great Hockham
19/03/2024128TF62Dersingham Bog
18/03/2024128TF63Dersingham
17/03/2024127TG10Cringleford / Intwood
12/03/2024127TG20Norwich (Earlham)
12/03/2024128TF62Dersingham Bog
30/11/2023227TG33Ridlington
02/10/2023128TF63Dersingham
30/09/2023128TF63Dersingham
Further info: Caloptilia betulicola
 
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