The Moths of Suffolk
428 Yponomeuta rorrella, Willow Ermine, (Hübner, 1796)

National Status : Local

Local Status : Probable migrant (SMP Status 3)

Distribution and abundance : Scarce

Flight Period : Single-brooded; July to August

Larval foodplants : White Willow (Salix alba) or Grey Willow (Salix cinerea)

Morley's Final Catalogue : Suddenly appeared in vast quantities on the Waveney at Beccles in 1936, and defoliated White Willows from Shipmeadow to Barnby (Trans. iii, p. 117). The larvae make no individual cocoons, and the pupae are attached to the common web by only their anal apices (cf. EMM. 1883, p. 137).

Wingspan details : Wingspan 19-24mm

Identification

Confusion species
    AdultYponomeuta evonymella, Bird-cherry ErmineYponomeuta padella, Orchard Ermine
Yponomeuta malinellus, Apple ErmineYponomeuta cagnagella, Spindle Ermine
Yponomeuta irrorellaYponomeuta plumbella
Yponomeuta sedella

Compare confusion species
    Adult

Click to view full size image
Ipswich, Suffolk (vii.2006) © Neil Sherman

Flight chart
JFMAMJJASOND
100 42

Life history chart
JFMAMJJASOND
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Further Photographs

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Eye, Suffolk (19.vii.2010) © Paul Kitchener