Dioryctria sylvestrella

Alternative names
Dark Pine Knot-horn
Maritime Pine Borer

Wingspan 28 to 35 mm.  Generally the largest of the four Dioryctria species occurring in Britain, it is best distinguished by the shape of the subterminal line, which is more smoothly curved than the obvious dentate lines of the other species.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.


Abroad, the species inhabits pinewoods.

When to see it

Flies July to September.

UK Status

After its initial discovery in 2001 in Dorset, there have been a number of records of this migrant from Continental Europe, mainly in the south-east of England. Records dating back to 1999 were subsequently found in collections and there may well be others undiscovered. In the Butterfly Conservation's Microlepidoptera Report 2011 this migrant species was classified as Nationally Scarce B.

VC55 Status

Infrequent migrant in Leicestershire and Rutland.

62.025 BF1454b

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map