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Acrobasis tumidana
Tufted Oak Knot-horn (Denis & Schiffermüller, 1775)
Pyralidae: Phycitinae
1435 / 62.033
Photo © Murray Smith,  13/08/2024 - Lingwood

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Similar Species
Beautiful Oak Knot-horn
Acrobasis repandana
Wingspan: 19-24mm
Flight: One generation, July to August
Foodplant:   Oak
Nat Status: Migrant
Verification Grade:  Adult: 3
Status
Scarce.

Immigrant from mainland Europe to southern England, with recent records in Suffolk.

The adult resembles Acrobasis repandana but shows a characteristic ridge of reddish raised scales next to a white crossbar.

Recorded in Bradwell, Norfolk (VC25 East Suffolk) in 2020 (K. Knights, 14/08/2020) and old Suffolk records from Fritton Lake, Norfolk (VC25) in 1934.

New for Norfolk in 2022 at Neatishead VC27 (J. Kelf, 10/07/22) and VC28 at Great Ellingham in 2023 (C. Knott, 13/08/23)

Retained Specimen / Photograph will be Required.

Recorded in 6 (8%) of 74 10k Squares.
First Recorded in 2022.
Last Recorded in 2024.
Additional Stats

Latest 10 Records
Date#VC10kArea
14/08/2024127TM49Thurlton
13/08/2024127TG30Blofield / Lingwood
07/08/2024227TG42Eccles
02/08/2024127TG21Norwich (Catton)
23/08/2023127TG30Blofield / Lingwood
13/08/2023128TM09Great Ellingham
10/07/2022127TG32Neatishead / Barton Broad
Further info: Acrobasis tumidana
 
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