Abstract
In Finland, the Hawthorn Moth Scythropia crataegella (Linnæus, 1767) was previously known in very few localities in the Åland Islands and one in Ab: Turku. It is strictly protected according to the nature conservancy law of the Åland Islands and regarded as endangered in Finland. In this study, Scythropia crataegella was observed in ten localities in the town of Mariehamn in the Åland Islands in 2010– 2012. The larvae fed on three Cotoneaster species and in one place on hawthorn (Crataegus spp.). The species is bivoltine in Mariehamn as larvae were observed in May–June and August and adults in June–July and August–September. The infestations were weak inmany localities, probably due to shearing of the hedges. As only some of all hedges in Mariehamn were searched for S. crataegella in 2011 and 2012, and it was found in several of them, the species is probably fairly common there.
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