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Oncocera semirubella
Rosy-striped Knot-horn (Scopoli, 1763)
Pyralidae: Phycitinae
1441 / 62.021
Photo © Jim Swalwell,  Flitcham, 12/7/14 with D. Jones

View all 24 photos >

Similar Norfolk Species: None
Wingspan: 17-29 mm.
Flight: June and July
Foodplant:   Bird's-foot trefoil and Clover.
Nat Status: Nationally Scarce B
Verification Grade:  Adult: 1
Norfolk Status
Flies in afternoon sunshine, later coming to light.
Popularly named the Rhubarb and Custard moth.

Resident on chalk downland and limestone cliffs, in the southernmost counties of England.

Increasing Norfolk records including Eccles in 2005 (N. Bowman, 29/07/05), Stoke Holy Cross in 2006 (A. Musgrove (21/07/06) and Overstrand in 2013 (G. Bond, 22/07/13).
New for VC28 in 2014 at Abbey Farm, Flitcham (R. Jones, J. Swalwell, 12/07/14) also Hockwold in 2014 (K. Puttick)

Records in more recent years from the Brecks suggest maybe a breeding population? Norfolk coastal records are of assumed migrants.

Recorded in 29 (39%) of 74 10k Squares.
First Recorded in 1900.
Last Recorded in 2021.

Latest 5 Records
Date#VC10k Area
25/09/2021128TF93 - Fakenham/Walsingham
09/09/2021127TG32 - Stalham/Catfield
10/08/2021227TG24 - Cromer
26/07/2021128TF74 - Holme/Titchwell
23/07/2021+28TF72 - Hillington/Houghton
Further info: Oncocera semirubella
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Mothdissection UK
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