What is a Woodworm Hole?
The hole that the Beetle makes to escape from the wood is called a flight hole.
It is cut by the beetle when it emerges from the little (pupal) chamber where
it changed (metamorphosed) from a grub (or 'worm') into a beetle, just as a Caterpillar
changes into a Butterfly.
Does a woodworm eat the wood?
No. The beetle only cuts a short tunnel and a hole, it does not actually eat at
all. The tunnel and hole often contain the wood cuttings and these can be seen
dribbling from the hole.
How big are the woodworm holes?
Between 1mm and 2mm, round. They look like 'dart' holes. If you look at them with
a magnifier you will see the bite marks around the edge of the holes, indicating
that they are not man-made
How does the woodworm hole tell me that the woodworm has been active recently?
Look down the hole with a magnifying glass. If the wood dust and hole edges look
bright in colour, it is most likely to be an 'active' infestation. An 'active'
infestation is considered to mean that the insect emerged in the last 2 years
and therefore Treatment is justified. If the wood dust and hole edges look grey
and dirty, it is probably an old infestation and there is no need to carry out
I can see dust coming out of the holes. What does this mean?
The dust is called 'frass'. It is the bore dust that the common furniture beetle
produces when he cuts holes. It is cream coloured, formed into lemon shaped pellets
and gritty when rubbed between the fingers.
What time of year do the holes appear?
The holes normally appear between May and September. This is the time when the
beetle is boring it's way out.
What are the holes called?
The holes are called Flight holes, Emergence holes and Exit holes. They are only
produced by the beetle, not the wood 'worm', which lives deep inside the wood
and bores tunnels.
Is it worth filling the holes?
Yes - fill them with wax, wood filler or paint/varnish. This enables you to spot
fresh holes in the future and tell whether the attack is dying out.
A Building Surveyor has reported that I have woodworm in my loft, but I cannot
find any holes?
Not uncommon. Sometimes Surveyors assume, based on the age and type of house,
that it must have woodworm, without even looking inside the roof.
I don't see any holes, only open topped tunnels?
These are likely to be old tunnels that have been exposed as the result of wear,
for Index Page
Policy | Returns
Policy | Home Page
01626 331351 F: 01626 331143
Other Property Repair Systems
- how to use Boron based insecticides/fungicides to treat timber rots
and insect attack
- how to treat penetrating dampness in walls and plaster
- how to treat patio decks and yacht decks
- how to kill Dry Rot in buildings
- membranes for lining damp walls, floors, basements and cellars
- epoxy resins for repairing wood, concrete, brick and stone
- upgrade doors to 30 minutes fire resistance
- how to quickly repair joists and beams of any size
- treat steel with Intumescent Paint to provide fire protection
- systems of repair, with step by step methods
- how to repair timber beams
- how to kill and prevent woodworm and death watch beetle