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16.005 ~ 0428 ~ Yponomeuta rorrella ~ Willow Ermine
UK Status

Resident & Migrant. Local, found in Britain as far north as Northumberland.

Montgomeryshire Status

Recorded from a single site at Commins Coch in the west of the county.

Wingspan :   M & F, 19-24mm.

Confusion species

Y. padella.
Flight time & Voltinity (Univoltine)


Wherever the foodplant is found.


White willow and grey willow.

Lifestage data

Web forming. Eggs (probably) laid in a similar fashion to other spp. of Yponomeuta. Larva feed gregariously in a web, usually 6-12 in each web. Pupates gregariously in web.
Montgomeryshire photos

Photo by PRW, 19th July 2006, Commins Coch