Description and Ecology
S. crataegella is a small moth is widespread almost all over Europe; it is absent from Great Britain north of Yorkshire, and has also not been recorded yet on Iceland and Ireland (where it is probably genuinely absent), in Portugal (where it may be absent), and in Slovenia (where it probably occurs but has not been found yet, as its range includes the surrounding countries). It is quite common throughout its range. The nocturnal adults are attracted to light sources; on Great Britain they are only commonly seen in July, but elsewhere they may be found from late May to September and have two generations per year.
The wingspan of adults is 11–15 mm. As usual for Yponomeutidae, the forewings have a bold black-and-white pattern: two thick but irregular black bands divide the white forewings into roughly equal inner, middle and outer parts, and the white between the bands has numerous small black spots. The hindwings are dusky greyish-brown and unadorned. The body is whitish. The caterpillar larvae feed in large groups from the safety of a silken web they produce together; young larvae are leaf miners. The mainstay food is leaves of Crataegus (hawthorn), hence the species' name. But they have also been recorded from other Spiraeoideae, e.g. Blackthorn (Prunus spinosa) and other Prunus species, Cotoneaster, as well as Malus sylvestris and Pyrus (pear).
Read more about this topic: Scythropia Crataegella
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