Crambus silvella, informally the bog grass moth, is a species of moth of the family Crambidae. It is found in Europe.
The wingspan is . It is very similar to Crambus pascuella, the key differences being as follows : forewings with apex little produced, dorsum less whitish, median streak less broad, continued beyond second line to termen, costal spot before second line much more elongate.Meyrick, E., 1895 A Handbook of British Lepidoptera MacMillan, London pdf Keys and description See also Parsons et al.Mark Parsons, Sean Clancy, David Wilson A Guide to the Pyralid and Crambid Moths of Britain and Ireland: Atropos, England.
It has one brood a year, most visible in July and August. It is active at dusk and into the night. It is found in boggy moorland and heathland, where it feeds on sedges (Carex); it lays eggs, and its larvae pupate, in the soil.
It is a rare species in the UK and in 2026 was found in Wales for the first time, in the Cors Geirch National Nature Reserve on the Llŷn Peninsula.
References
Bibliography
External links
Lepiforum de waarneming.nl Crambus silvella at UKmoths