of most softwoods, particularly roofing timbers.
Solid timber At
present common only in area of England SW of London (mainly Surrey)
where special Building Regulations exist to protect structural timber
and prevent further spread. Small inactive infestations are common
in buildings over 100 years old in London. Isolated infestations
in other parts of country usually stem from imported infested packing
Panel products Very
occasionally found in softwood plywood.
General May be
overlooked in early stages. With large infestations, larval feeding
may be audible on warm days as scraping noise.
Emergence holes Few,
large, oval, often ragged, 6 - 10 mm diameter.
Tunnels Oval, 6
- 10 mm diameter. Extensive and join up to cause almost complete
disintegration of sapwood but leaving thin, intact, surface skin.
Dust-filled tunnels may cause blisters or corrugations on surface
of wood which may be observed with oblique lighting from torch.
Bore dust Cream-coloured,
sausage-shaped pellets. Gritty when rubbed between fingers. Small
chips and wood fibres may be present.
Likely misidentifications Forest
longhorn beetle, jewel beetle, wharf borer beetle, wood wasp, Tenebrionid
beetle, Bostrychid powderpost beetle.