What does a woodworm look like and how to get rid of it effectively? Identification, types and proven methods

You open the door of your grandmother's wardrobe and see a small pile of light dust on the shelf. Lower down, in the side of the chest of drawers – a few round holes the size of a grain of rice. First thought: did someone drill these? Second, much less pleasant: perhaps woodworms have infested the wood?

The common furniture beetle is a colloquial name for several species of insects that feed on dry wood in furniture, beams, and interior finishes. Left unchecked, it can turn a solid oak table into a hollow shell in a few years. The good news is that if you identify the problem early, in most cases, you can save the furniture. In this guide, we explain what a woodworm looks like, how to recognize its presence, and how to get rid of it effectively – using home remedies and when heavier artillery is needed.

What a woodworm looks like and what woodworms look like at different stages of development

Before the fight begins, it's worth knowing what you're dealing with. What do woodworms look like in practice? That depends on the stage of development – the life of these insects is divided into four distinct phases.

• Egg – tiny, white or cream-colored, about 0.5 mm long. Females lay them in wood crevices, so they are practically invisible to the naked eye.

• Woodworm larva – this is what causes the most damage. White or cream-colored, slightly curved into a "C" shape, with a brown, hard head. Length ranges from 3 to even 20 mm depending on the species. The larva tunnels through wood for several months, and in some cases, even several years.

• Pupa – immobile, resembles an adult insect in shape, but is lighter and softer.

• Adult stage – a small beetle, most often brown, black, or dark beige. Size varies from 2.5 mm (common furniture beetle) to even 25 mm (house longhorn beetle).

What does an adult woodworm look like? In most cases, it's an elongated, cylindrical beetle with a clearly defined head shield. We usually only see it fleetingly – in the evening, when it flies out of a hole in the furniture, or dead on the windowsill.

What does a house woodworm look like and how to recognize woodworms in your home – key signs

Most people will never see a live woodworm – they only notice its traces. How to recognize woodworms in your home, even if no beetle has shown itself to you?

Key signs:

• Small round holes in the wood – from 1 to 3 mm in size (common furniture beetle) or 5-10 mm and oval in shape (house longhorn beetle). These are the exit holes of adult insects.

• Fine, light dust under furniture – so-called wood flour, falling out of the tunnels.

• Quiet tapping on a quiet night – male common furniture beetles tap their heads against the tunnel walls, attracting females. Hence the second name: "deathwatch beetle."

• Weakened wood – the furniture sags under pressure, a hollow sound is heard when tapped.

• Dead beetles on windowsills, especially between May and August, when adult specimens leave the wood.

A mini-checklist to perform once a year, preferably in spring:

• examine the undersides and back panels of furniture – that's where attacks most often begin,

• check ceiling beams, window frames, and floorboards in older homes,

• inspect inherited furniture carefully before bringing it into your home,

• vacuum around wooden furniture every few weeks – fresh sawdust will reappear if the infestation is active.

Woodworms – types and what works best against them

The types of woodworms are a broader topic than it seems. In Polish homes, you will most often encounter three species, each requiring a slightly different approach.

Common furniture beetle (Anobium punctatum) – the most common "house woodworm." The adult is 2.5–5 mm, exit holes are characteristic dots 1–2 mm in diameter. It likes dry, older wood – furniture, floors, picture frames. The development cycle lasts from 2 to 5 years.

House longhorn beetle (Hylotrupes bajulus) – much more dangerous for the building structure. The adult beetle is 8–25 mm, exit holes are oval, 5–10 mm. It primarily attacks coniferous wood in ceiling beams, roof trusses, and logs. This species of woodworm larva can work in wood for up to 10 years – hence the scale of destruction.

Powderpost beetle (Lyctus linearis) – attacks fresh hardwood, mainly oak and ash parquet. Small holes (1–2 mm), very fine dust, common in new floors made of insufficiently dried wood.

What works best against woodworms depends on the scale of the problem:

• for single holes in furniture – wood insecticides in gel or aerosol, to be injected directly into the holes,

• for infestation of larger furniture – fumigation chamber, freezing, or chemical treatment bath (usually performed by a furniture restorer),

• for ceiling beams and roof trusses – only professional disinfestation, most often by gassing or microwaves.

We write more about everyday wood protection and care in a separate guide on wooden furniture care.

How to get rid of woodworms from wood – effective methods and home remedies

How to get rid of woodworms without immediately calling a specialist? Home methods make sense for small, limited infestations – a single piece of furniture, a stool, a picture frame. The larger the area, the stronger the argument for professional treatment.

How to combat woodworms with home remedies:

• Wood insecticides available in hardware stores (most often permethrin-based). They are injected with a syringe into the exit holes, and then the entire surface is coated. Repeat the treatment after 2-3 weeks.

• Freezing – wrap smaller furniture (stools, drawers, frames) tightly in a plastic bag and place them in the freezer for at least 2 weeks at -18°C. This effectively kills all developmental stages.

• High temperature – thermal chamber or oven with a low-temperature function (55-60°C for several hours). Caution: wood may crack, so this is a method for experienced individuals.

• Heated linseed oil rubbed into the wood – an old, proven method for mild infestation. The oil penetrates the tunnels and cuts off oxygen supply to the larvae.

• Replacing infested fragments – in cabinet furniture, it is sometimes easier to replace the back panel than to save it with chemicals.

How to get rid of woodworm from a load-bearing beam? Do not experiment here – damage to a structural element of the house is not a matter for home methods. Call a company specializing in wood disinfestation, who will assess the condition of the beam and choose a method: gassing, microwaves, or pressure injection with a preparation.

Prevention is cheaper than cure. It is worth:

• maintain air humidity around 40–55%,

• coat wood with oil, wax, or varnish – a protected surface is less attractive to egg-laying females,

• before bringing old furniture into the house, inspect it thoroughly, and if in doubt, freeze it or subject it to a preventive treatment.

Frequently asked questions

Are woodworms dangerous to humans? 

No. They do not bite, sting, or transmit diseases. They pose a threat only to wood – but in the case of load-bearing beams, this can eventually lead to structural damage to the building.

Where did the woodworm in my house come from? 

Most often from inherited furniture, old window frames, firewood, or new, insufficiently dried flooring. Adult females can also fly in through an open window in summer.

Does fresh dust under furniture always mean an active infestation? 

Yes – fresh, light wood flour is a sign that larvae or adult insects are still feeding. Old dust is darker and more compacted.

Are store-bought preparations sufficient for ceiling beam infestation? 

Generally, no. Beams are too thick for aerosol preparations to reach deep into the wood. Here, professional pressure injection or fumigation is needed.

Can a piece of furniture with numerous holes be saved? 

It depends on the structural condition. If the wood is soft and sags under your finger, rescue may not be cost-effective. For individual holes, treatment plus filling imperfections with wax or wood putty is usually sufficient.

How long do you have to wait after disinfestation before the furniture is safe? 

After professional treatment, usually 24–72 hours of airing. After home freezing – the furniture can be used immediately after thawing and drying.

Old wood has a soul and a history that cannot be recreated in any catalog – it is worth fighting for. However, when a piece of furniture is truly beyond saving, it's good to choose a successor wisely: from well-dried and properly protected wood. If you are looking for furniture that will last a long time and pass down to the next generation with peace of mind, check out the wooden furniture collections at Pillovely – we consciously choose materials so that your home remains a warm place for years to come.

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