Termites or woodworm? How to tell them apart before the wood is lost

If you see thin mud tubes on a wall, or small wings of equal length at a window, you most likely have termites. If you see small round holes with fine wood powder falling from them, you most likely have woodworm. Termites usually come up from the soil and live in a colony. Woodworm is a larva growing inside the piece of wood itself, so the treatment differs from the start.

A wrong diagnosis gets expensive. Spray ant killer into a hole in a chair leg and the larvae keep working in the heart of the wood. Paint a woodworm product on your door frame while the colony sits in the soil under the tiles and you’ve handed it extra time. I open every inspection with two questions: where’s the mud, and where’s the powder? Full service details are on our woodworm treatment and ant and termite control pages.

Quick comparison table

Start with this table, a flashlight and a phone for photos.

Sign	Termites	Woodworm
What is it?	A social insect in a colony, closer to cockroaches than to ants	Larvae of small beetles that live and feed inside wood
Where does it come from?	Usually the soil, through foundation cracks or mud tubes	Eggs in cracks in bare wood, or an infested piece brought home
Clearest evidence	Mud tubes, wings of equal length, thin-surfaced wood	Round holes with powder falling beneath them
Holes	Unusual in subterranean species; drywood species open holes under 2 mm	Roughly 1 to 3 mm in common species, up to about 6 mm in some
What it leaves behind	Mud in subterranean species, 6-sided pellets in drywood species	Flour-like powder, or powder with small pellets
What it eats	Wood, paper, cardboard and books; prefers damp or decayed wood	The wood itself; the preferred type varies by beetle
Moisture	Needs damp conditions because its body dries out fast	More active at 15% to 32% wood moisture
Speed of damage	A mature colony can hold hundreds of thousands of individuals	Usually slower; major structural damage takes successive generations
Who should handle it?	A licensed specialist; home products are unreliable	Simple steps may do for one piece; a wide infestation needs a specialist

The table settles most cases, with one exception. Drywood termites live deep in the wood and open holes under 2 mm to push out their droppings, so to the eye they can pass for woodworm. The University of California says this confusion happens. If you find separate pellets under a hole instead of flour-like powder, photograph them up close and leave them for the technician.

You can also find both signs in one home, since both insects like moisture. A leaking bathroom next to a wooden door frame can have termites at the base of the frame and woodworm in the door above it. Either way, the first call goes to the plumber.

Termites: appearance, mud tubes and winged swarmers

Termites rarely show themselves. The US Environmental Protection Agency says they seldom leave the soil, their mud tubes or the wood they’re eating, and that most people don’t know they have them until they see a swarm or find damage during renovation.

What workers and soldiers look like

A worker is pale caramel, soft-bodied, wingless and blind. Workers make up 90% to 98% of the colony in the species Mississippi State University covers. A soldier has a larger, darker head and two big jaws. Break off a small piece of a mud tube and you may see both running around inside.

Mud tubes

Mud tubes are the most visible sign of subterranean termites, according to the University of California. These insects dry out very easily, so they build a covered passage whenever they have to cross concrete, brick or metal. In Egyptian homes, check the base of the wall at the floor tiles, behind any wardrobe pushed against the wall, under the stairs, and around basement drain pipes.

Photograph a tube first, then break off a piece about as long as a finger joint. Soft, moving creatures inside mean an active infestation right now. An empty tube isn’t the end of the story, so keep checking the wall and the wood nearby.

Wood that sounds hollow

Subterranean termites usually eat along the grain and leave a thin surface that’s easy to puncture. The EPA advises probing exposed wood with the tip of a flat screwdriver. Testing the bottom of a door frame takes a minute, and if the tip sinks in easily you have your answer. Don’t break the whole board.

The EPA’s guidance for schools lists other signs that apply at home too: swollen or bowed wood, stains that look like water marks, and a moldy smell. These can have other causes, so don’t decide on them alone.

Winged termites: what does seeing them mean?

A winged termite is the reproductive that leaves the colony to start a new one, then drops its wings after landing. It has two pairs of wings of equal length. A flying ant has longer front wings, a narrow waist and an antenna bent at a right angle, while a termite’s antenna is straight and may droop. That comparison comes from the EPA and Texas A&M.

Location decides what it means. A swarm in the street or above a lamp post doesn’t prove you have an infestation, as the University of California says plainly. Winged termites inside the home are a reliable sign, according to Texas A&M. Look for piles of matching wings on the marble window sill or under a light, because the wings stay behind after the insects are gone.

The American species Mississippi State describes need about 5 years or more before a new colony can invade a building or produce winged termites. A swarm that came out of your wall today may have years of underground work behind it.

Termites aren’t ants at all

In Arabic we call them white ants, and the name misleads people. Termites are now classified in the same order as cockroaches, Blattodea. Their life cycle runs from egg to nymph to adult with no pupal stage, and their workers are male and female, while true ant workers are all female. They digest cellulose with help from microorganisms in their gut, which is why they eat wood, cardboard, paper and books.

Don’t rely on supermarket ant killer against termites unless its label clearly lists termite control and protecting structures. The EPA points out that products claiming only to kill termites haven’t been shown to protect a building.

In Egypt the story goes back a long way. Research from Ain Shams University’s Faculty of Science, presented at a 1973 conference in London, notes that ancient Egyptians imported pine from the Levant for coffins to protect their mummies from termites. The study recorded two species as the most damaging and widespread. Anacanthotermes ochraceus is most common in the Nile Delta and prefers wheat and rice straw. Psammotermes hybostoma, a sand termite, is concentrated in Upper Egypt, the desert margins and the oases, and it damages trees.

The researchers also counted about 200 infested houses in one Fayoum village, some abandoned by their owners. The data is old and the distribution may have changed, but it helps explain why rural mud-brick houses were more exposed than others.

Woodworm: dust, holes and sounds in the wood

In the Egyptian market, the word covers more than one insect. What we call woodworm is mostly the larvae of beetles living inside wood, and you see nothing of them until the adult comes out and leaves a hole. The hole is an exit door, and the generation working now may still be inside.

The adult is small and reddish brown, about 3 to 6 mm long in lyctid and furniture beetles.

Hole size and powder type

Iowa State University describes the common species below, with inches converted to millimeters. I added the old house borer from the Penn State reference.

Type	Approximate hole diameter	Powder
Lyctid beetles (Lyctidae)	0.8 to 1.6 mm	Very fine like flour, falls out easily
Bostrichid beetles (Bostrichidae)	2.4 to 7 mm	Coarse like semolina, rarely falls out
Furniture beetles (Anobiidae)	1.6 to 3.2 mm	Powder with small oblong or round pellets
Old house borer	About 6 mm, oval	Dust with pellets shaped like tiny barrels

All these references are American or British and the species common in Egypt may differ, so treat the numbers as a rough guide.

Fresh powder and old powder

Powder alone doesn’t prove the woodworm is alive. Dust can keep falling from old holes long after an infestation has ended, as Iowa State explains. The UK’s Property Care Association (PCA) says to establish whether an infestation is active or old before any treatment, because some end on their own.

Try one or more of these:

1. Clean away all the powder and put a dark sheet of paper under the piece. The University of Maryland treats piles returning weeks after cleaning as evidence of an active infestation.
2. Check inside the hole with a flashlight. A recent hole looks clean and pale with a fresh trace of powder, as the UK consumer organization Which? describes it.
3. Fill every hole in a 30 by 30 cm area with colored wood filler or thick paint, then look again after 6 to 12 months. New holes in that area mean ongoing activity. Iowa State suggests this test.

Does woodworm make a sound?

Yes, sometimes. The University of Maryland says large larvae make a scraping or clicking sound, especially in spring and summer when the wood’s moisture rises. Put your ear against a wardrobe door or a ceiling beam at a quiet hour of the night.

Why did woodworm show up in your home?

The female lays eggs in cracks, pores and old holes in unfinished wood, so the back of a wardrobe, the bottom of a drawer and the underside of a table are the first places I check. Activity rises at 15% to 32% wood moisture with starch above 3%, according to Iowa State. You get those conditions in a basement, near a leaking bathroom or under a leaking roof.

An infestation can also arrive with new furniture. Mississippi State explains that kiln drying kills the insects present at the time, but the wood can be infested afterward, during storage and transport and before finishing, and that the lyctid life cycle can run 1 to 4 years. If you bought a bedroom set from a workshop in Damietta, Egypt’s furniture-making city, and a hole appears two years later, your home isn’t necessarily the source.

The idea that woodworm only eats old wood is wrong too. Lyctid larvae depend on starch, which declines as wood ages, so most of their heavy infestations are in wood under 10 years old. Furniture beetles lean the other way, toward aged wood that has started to decay slightly.

The season: when should you watch out?

The precise dates available were recorded outside Egypt, so take them as general guidance. In California, native subterranean termites fly in the afternoon in spring or fall, on clear days after heavy rain. Formosan termites fly at dusk or in the evening and are drawn to light. Drywood termites fly by day in summer and fall.

Woodworm in Britain is mostly active from March to October, according to Which? In Egypt, write down the date you first see powder and the date it returns after cleaning. That note is worth more to a technician than any calendar.

Which wood gets infested in Egypt?

These are the spots I walk through during an inspection:

• On wooden salon and dining sets, the bare parts under the seat and inside the legs are weakest.
• The plywood back of a wardrobe and the bottom of a drawer are often unpainted, and Which? names both. Cardboard stacked behind the wardrobe is ready food for termites.
• On an apartment door, focus on the lower frame where it meets the tile, especially near a bathroom or basement door. Subterranean termites climb from below and prefer damp wood.
• Wooden ceilings in older houses are their own story. The old house borer feeds on softwoods, mostly in thick beams, and is rarely found in wood under 2.5 cm. Its larval stage can last 3 to 15 years, and moisture under a leaking roof helps it spread.
• In the countryside, the Ain Shams study linked heavy termite numbers to mud brick, crops stored on rooftops, straw kept for over a year and palm-frond fences.

Wood type matters differently for each insect. Lyctids attack only hardwoods such as oak, which Egyptian carpenters call aro, and leave alone softwood such as the pine they call mosky. Furniture beetles infest both.

When can wood be saved, and when must it be replaced?

The strength of the wood decides this more than the number of holes. Mississippi State says of floors that a few dozen holes in the early years are common in susceptible wood, while the worst cases are boards with hundreds of holes that can’t bear a chair leg, usually tied to a moisture problem.

Situation	Likely decision	Practical note
A few holes in a strong piece	Save it	Confirm activity, fill the holes, keep it dry
Parquet with dozens of holes in one board	Replace or treat the board	Refinish the floor so no bare wood remains
Hundreds of holes, or boards that can’t bear weight	Replace	Find the moisture source first
One or two pieces of limited value	Replacing is simpler	The University of Maryland suggests this when few pieces are infested
Antique or expensive piece	Save it under a specialist	Heat chamber or freezing, never a home oven
Thin-surfaced wood a screwdriver sinks into	Usually replace	Find the termites’ way in first
Ceiling beam or load-bearing wood	An engineer decides	The University of California calls for an engineer or contractor
Wood touching soil in a basement	Lift or separate it	Left as is, it keeps the road open for the insect

Replacement wood should be treated before installation, as the PCA recommends. For a valuable piece, Iowa State mentions a dedicated heat chamber at 56 to 66°C for 30 minutes to 4 hours, with humidity controlled to prevent cracking, and Maryland mentions fumigation in a sealed chamber or a large freezer. Try it in your kitchen oven and the wood may crack.

Woodworm generally gives you time to think. The larvae work slowly, and wide structural damage usually takes successive generations, according to Maryland and Iowa State, so don’t cut out the beam on day one. Termites are different. Texas A&M advises a professional inspection as soon as you suspect them.

Woodworm treatment at home: what works and what doesn’t

Kerosene and diesel

This suggestion comes up all the time, and I advise against it. A paper from the 2011 International Conference on Urban Pests describes these solvents as toxic and says their flash point makes them a fire hazard. You’d be putting them on wood in an apartment with a gas stove and a water heater. That paper discusses them as carriers for an insecticide in studied formulations. It doesn’t discuss pouring them on a wardrobe by themselves.

Bleach, vinegar and garlic

I found no recommendation for bleach, vinegar, or garlic with salt against termites or woodworm in any university or government reference I consulted. The larva lives inside the wood, and Which? explains that even dedicated surface treatments don’t reach the full depth, so what you wipe on a wardrobe won’t get to it.

Powder that stops for a few days after cleaning can fool you into thinking the recipe worked.

Off-the-shelf pesticides

With termites, I don’t recommend experimenting. Texas A&M couldn’t demonstrate in its tests that home products succeed, and the University of California calls consumer products against drywood termites ineffective. Injecting soil the wrong way can contaminate the home and nearby drinking water, the EPA warns.

Woodworm is more forgiving. Which? says a store product can work if the infestation is caught early, provided you remove the varnish first, cover all the wood and follow the instructions. The PCA calls for caution and protective clothing with any chemical.

What helps until the technician arrives

• Photograph the holes or tubes next to a ruler, and note the date you first saw them.
• Don’t fill the holes if you’re waiting for an inspection, because the technician needs to see them and work through them.
• Improve ventilation and run a dehumidifier if you have one. Lower moisture reduces woodworm activity, according to Iowa State.
• If an infestation is old and definitely over, seal the holes and cracks with varnish or filler so they don’t become egg-laying sites.

How is it treated?

I’d rather you know the scientific picture before you hear any company’s pitch, ours included.

Termite control

The most widely used method against subterranean termites is treating the soil with a dedicated liquid, by flooding or injection, according to the University of California. Texas A&M says liquids applied by a good company are usually fast and reliable and stay in the soil for 5 years or more. Baits use a slow-acting substance that workers carry back to the colony, and they can take months or years. Fumigation doesn’t suit subterranean termites inside buildings and is used against drywood termites in wide infestations. Nobody can honestly say every termite case ends the same way or in the same amount of time.

Woodworm treatment

The basis is confirming activity, then applying an approved product to all infested parts and the adjacent wood, with care for undersides and hard-to-reach spots, as the PCA explains. Penn State points out that some surface treatments don’t work on painted or waxed wood, and Iowa State calls for removing the finish first. Ask any technician one specific question: how will you reach the larvae in this particular piece?

A new hole after treatment doesn’t automatically mean the treatment failed. Which? notes that emerging beetles contact the treated material and that some activity is expected in treated areas. Photograph it, note the date and talk to your technician.

Before you agree with any company

Ask about the license first, as the EPA advises. Ask whether the product’s label states use against this specific insect. Read the warranty before you agree, since Texas A&M considers it among the most important items in a termite contract, and ask exactly what it covers, the soil alone or the wood as well. The University of California says an inspection by a licensed professional is required before any treatment.

The Safety Service method

At Safety Service, our woodworm method is to inject a dedicated pesticide into the holes one by one, coat the affected surfaces with a product that soaks into the wood, and check the neighboring pieces. With termites, we inject the soil and the infested wood with a dedicated pesticide. Under the company’s system this is done in one visit, without you leaving your home, and with a 5-year warranty. That describes how we work, as the technician sets it after inspecting your home. It isn’t a scientific rule for every infestation.

Buying used furniture and storing wood

Before you pay at a used-furniture market, turn the piece over. The back, the bottom of the drawer and the insides of the legs tell you far more than the glossy face. Look for holes that are pale inside and powder in the drawer corners, then press a key or small screwdriver on the weakest spot.

If you’re ordering a bedroom from a workshop, ask how the wood was dried, because the University of Maryland advises kiln-dried or air-dried wood. Ask for the hidden parts to be finished too, since varnish on the back of a wardrobe closes the pores where the beetle lays eggs.

For storage, raise boards off the floor on supports, away from the wall, with air around them. Keep firewood and carpentry scraps away from the house, as the EPA advises.

For a home that has already had subterranean termites, the University of California recommends an inspection every few years, and says regular checks every 3 to 5 years catch an infestation before it becomes destructive.

Frequently asked questions

Are termites dangerous to people?

Termites pose no direct danger to human health, according to the US Environmental Protection Agency. The danger is to the wood. The EPA warns of damage that can cost thousands of dollars, and of structural damage when tunnels are left untreated. Check the door frame and any wood close to the floor.

What does it mean if termites appear in my home?

Termites inside the home usually mean an active infestation nearby, especially if you find matching wings at the window or mud tubes on a wall. A swarm in the street doesn't prove your home is infested. In the species that have been studied, a new colony can take about 5 years to produce winged termites, so the infestation may be older than you think.

Does woodworm make a sound?

Yes, woodworm can make a faint scraping or clicking sound inside the wood. The University of Maryland links it to large larvae and says it is heard more in spring and summer, when the moisture in wood rises. Silence doesn't clear a piece, because small larvae are barely audible. Fresh powder and new holes are stronger evidence than your ear.

Can woodworm be treated?

Yes, woodworm can be treated, and the right treatment depends on whether the infestation is active, how strong the wood is and what the piece is worth. In a light case, lowering the moisture and filling the holes may be enough. Other cases call for replacing weak boards or applying an approved product. Antiques need a specialist. Always start by confirming the woodworm is still alive, because some infestations end on their own.

How can I tell a winged termite from a flying ant?

A winged termite has two pairs of wings of equal length and a broad waist, while a flying ant has longer front wings and a narrow waist. Check the antenna too: a flying ant's bends at a right angle, and a termite's is straight and may droop.

Does home woodworm treatment work?

Home woodworm treatment can work only on an early, limited infestation in unpainted wood, with a dedicated product used according to its instructions. The UK consumer organization Which? stresses that surface treatments don't reach the full depth of the wood. Replacing a small piece may be easier than treating it. Kerosene and diesel bring fire risk and toxicity, with no benefit to justify either.

What is the best termite killer?

No single pesticide suits every termite case. The choice depends on the species, where the infestation is and how the house is built. Accepted methods include soil treatment, baits and wood treatment. The EPA calls for a product whose label clearly says it is for controlling termites and protecting structures, and it warns that incorrect application can contaminate the home and nearby drinking water.

Can woodworm spread from one piece of furniture to another?

Yes, woodworm can spread to nearby bare wood, because adult beetles lay eggs in cracks and old holes. Furniture beetles are known for reinfesting the same wood. Lyctid beetles don't attack softwood, and the Mississippi State reference considers it unlikely they would infest a whole building. Check the pieces touching the infested one before you judge the size of the problem.

Sources

1. Termites: Pest Notes (University of California Statewide IPM Program)
2. Drywood Termites: Pest Notes (University of California Statewide IPM Program)
3. Termites: How to Identify and Control Them (US Environmental Protection Agency)
4. Termites and Schools (US Environmental Protection Agency (January 2021 archive))
5. Frequently Asked Questions About Subterranean Termite Control (Texas A&M AgriLife Extension)
6. Termite Biology (eastern subterranean termites and Formosan termites) (Mississippi State University Extension)
7. The White Ants of A.R. Egypt (A.H. Kaschef and L.S. El-Sherif, Faculty of Science, Ain Shams University)
8. Powderpost Beetles (Iowa State University Extension and Outreach)
9. Powderpost Beetles (University of Maryland Extension)
10. Powderpost Beetles in Hardwood Floors (Mississippi State University Extension)
11. Old House Borer (Penn State Extension)
12. Woodworm Treatment (Property Care Association (UK))
13. How to Treat Woodworm (Which? (UK))
14. Infiltration of Insecticides Using Kerosene, Diesel Fuel, Water, and Polymer Into Wood (International Conference on Urban Pests, 2011)