Photo © Mike Wall
Willow Ermine
Yponomeuta rorrella
Checklist Number16.005 [B&F: 0428]
Verification
Record will require further evidence, at least a good photograph, unless CMR is aware recorder has confidence in identification
Classification
| Family: | Yponomeutidae |
| Subfamily: | Yponomeutinae |
| Genus: | Yponomeuta |
| Species: | rorrella |
| Authority: | (Hübner, 1796) |
As a resident, favours coastal locations in southern and eastern counties, where the food plants occur, but most frequently encountered as a migrant, when it can be abundant; as such, there are numerous records from South Hampshire, but less frequent in the north. Surprisingly, un-recorded on the Isle of Wight until 2012, when a major influx saw 8 individuals reported, and has been annual since.
Wingspan 19-24 mm. Very difficult to separate from Orchard Ermine Y. padella and Apple Ermine Y. malinellus, but grey wash generally restricted to dorsal half of forewing: if this is not clear, then records need to be aggregated as 'Yponomeuta sp.' Larva feeds on White Willow and Goat Willow, living gregariously within a silken web.
Wingspan 19-24 mm. Very difficult to separate from Orchard Ermine Y. padella and Apple Ermine Y. malinellus, but grey wash generally restricted to dorsal half of forewing: if this is not clear, then records need to be aggregated as 'Yponomeuta sp.' Larva feeds on White Willow and Goat Willow, living gregariously within a silken web.
The abundance in each month is indicated as follows:
No records
Very occasional
Irregular
Uncommon
Off-peak, but not unusual
Off-peak, but not unusual
Main flight time| J | F | M | A | M | J | J | A | S | O | N | D | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adult | | | | | | | | | | | | |
| Larval | | | | | | | | | | | | |
Records by week (adult)
Records by week (larval)
