Sesiidae : Tinthiinae
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Photo © Ian Gamble,  Berkhampstead, Hertfordshire (23/07/21)

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Six-belted Clearwing
Bembecia ichneumoniformis
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Raspberry Clearwing
Pennisetia hylaeiformis

(Laspeyres, 1801) 369a / 52.001

General Remarks:
The source of the Raspberry Clearwing in Britain is unknown. It was added to the British list by Reid (2008) from South Cambridgeshire and North Hertfordshire and was subsequently found to be widespread in Hertfordshire on `domestic` raspberry plants. First observations of egg-laying were also made in Hertfordshire (Craig, 2012). It may have persisted at very low density of wild raspberry plants in Hertfordshire woodland; most clearwing species were considered rare until the use of artificial pheromone lures became popular.

The decline in reports during 2014 is remarkable and unexplained; overall the mean of the graph line suggests a stale population.

Hertfordshire Notes:
Plant notes (2016) that this species was discovered new to Britain during 2007 at Meldreth in Cambridgeshire by Jim Reid (Reid 2008) and was subsequently found by him at nurseries in northern Hertfordshire. Use of synthetic pheromone lures during 2009 produced no less than 8 adults at Rye Meads RSPB nature reserve on 23rd July. A further six were found on 25th July 2009 when a female was also observed apparently egg-laying on the upper surface of raspberry leaves at about 10.40 hours. (Joan Childs, Paul Chapman, J McGill, W. Urwin,H. Taffs, K. Tailby, P. Hammond, P. Clarke, M. Deans and P. Bryant). Phil Gould found an adult amongst his raspberry canes in his garden at Kimpton, 30th July 2009 and I recorded a male at the HYL lure in my Bishops Stortford garden in the first week of August 2009 (the date it entered the pheromone trap is unclear as I was not around to check). Several mature larvae found in my garden in Bishops Stortford in April 2010.

Middlesex Notes:
Local, but without question under-recorded and probably widespread. It may well be present wherever Raspberries Rubus idaeus are grown, as is the case in Hertfordshire to the north of us.

Recorded in 15 (37%) of 41 10k Squares.
First Recorded in 2009.
Last Recorded in 2023.
Additional Stats

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List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
16/08/2023120TL21 - Welwyn Garden City
14/08/2023120TL23 - Letchworth / Baldock
07/08/2023320TL42 - Bishop's Stortford (N)
20/07/2023220TL22 - Stevenage
18/07/2023320TL12 - Hitchin (S) / Whitwell
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record Raspberry Clearwing
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 11-13mm
Flight: July - August
Foodplant:   Raspberry
Red List: Least Concern (LC)
GB Status: Not Assessed / Adventive
Former Status: Adventive
Verification Grade:  Adult: 1
 Immature Adult   [Show Flight Weeks]
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