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Ocnerostoma friesei
Grey Pine Ermine (Svensson, 1966)
Yponomeutidae: Yponomeutinae
445 / 16.024
Photo © Neil Sherman

Similar Norfolk Species
White Pine Ermine
Ocnerostoma piniariella
Wingspan: 8-10mm
Flight: Two or Three Generations
March - May, Aug, Nov
Foodplant:   Scots Pine
Nat Status: Local
Verification Grade:  Adult: 4
Norfolk Status
Double or triple-brooded.
Males have pale grey forewings, females are white.

Can be confused with the similar pine feeding species Ocnerostoma piniariella.
O. friesei initially has an earlier flight time, however a gen. det. is required to confirm any specimens.

Note differences in antennae, Ocnerostoma friesei: grey. O. piniariella: ringed white and pale grey (male) and white (female)
To see this, a very good hand lens or low-powered microscope with good lighting is required.

The larvae, not distinguishable from O. piniariella, mine the needles of the foodplant from December to March, June to July and sometimes September.

First Norfolk record at Dersingham in 2011 (R.Jones, 14/04/11)

[MBGBI vol3, p65]

Determination by Genitalia Examination (gen. det.) Required

Recorded in 8 (12%) of 69 10k Squares.
First Recorded in 2011.
Last Recorded in 2020.

Latest 5 Records
Date#VC10k Area
15/08/2020128TL79 - Methwold/Foulden
11/08/2020127TG14 - Sheringham
05/08/2020128TL78 - Hockwold/Weeting
08/05/2020128TF81 - Castle Acre/Litcham
08/05/2020328TL79 - Methwold/Foulden
Further info: Ocnerostoma friesei
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