Drywood Termites: Spot the Signs and Choose Your Next Step

Drywood termites live and feed inside dry timber, so an infestation may leave little obvious evidence until pellets, damaged wood or winged termites appear. The most useful clue is often a small pile of firm, sand-like pellets beneath tiny holes in wood, but no single sign confirms the pest. Old pellets can remain after activity stops, and other insects can leave similar debris. If you suspect drywood termites, photograph the evidence, note where it appears and arrange an inspection before choosing a treatment. Correct identification matters: drywood termites differ from subterranean termites, and advice or treatment options can vary by location.

What signs can drywood termites leave behind?

Drywood termites remove little debris from the outside of the wood. They tunnel within timber and push their droppings, commonly called frass, through small openings. This makes pellets one of the clearest clues, although their presence alone cannot establish whether a colony is active or how far it extends.

• Small piles of pellets: Look for firm, grain-like droppings beneath timber, furniture or a small opening. The pellets may be light or dark depending on the wood and can be mistaken for sand, dust or other insect debris.
• Tiny holes in wood: Small openings may be where termites have expelled pellets. A hole can be hard to see, covered by paint or no longer in use.
• Winged termites or shed wings: Swarming reproductives may emerge from an infested structure or nearby wood. Their presence is worth investigating, but winged ants and other insects can be confused with termites.
• Damaged or weakened timber: Wood may sound hollow when tapped, break more easily than expected or show blistered finishes. These signs are not specific to termites and can also result from decay, moisture or other pests.

Pellets can collect in places that are rarely disturbed: beneath window or door frames, near furniture, in cupboards, in roof spaces or around exposed beams. Check the area above and beside a pile for a small opening, but don’t assume the nearest piece of wood is the source. Pellets can fall or be moved away from the damaged section.

Old debris can persist after an infestation has been treated or has stopped. If you clean a small area and pellets appear again, that is a reason to seek advice, but it still does not confirm the cause. Take clear photographs before cleaning, record the location and date, and avoid filling or painting over a suspected hole until it has been assessed.

How do drywood termites differ from other wood pests?

Correct identification helps prevent unnecessary treatment. Drywood termites live in the wood they infest and do not need to travel between timber and soil. Subterranean termites generally depend on a connection to the ground or another source of moisture, while wood-boring beetles have different signs and life cycles. These are useful distinctions, not a substitute for an inspection.

Termite swarmers can sometimes be distinguished from ants: termites generally have straight antennae, a broad waist and two pairs of wings of similar length. Ants typically have elbowed antennae, a pinched waist and front wings longer than the hind wings. Insects may be damaged or difficult to inspect, so save a specimen in a sealed container or take a close photograph if you can do so safely. Don’t rely on wing shape alone to decide whether a building is infested.

Where should you look for drywood termite evidence?

Start with places where timber is visible and where pellets could fall and collect. Use a torch, and inspect slowly rather than tapping or cutting into structural wood. Give extra attention to:

• Window and door frames, skirting boards and exposed trim.
• Roof spaces, beams, rafters and other accessible structural timber.
• Wooden furniture, cupboards, shelving and timber stored indoors.
• Joints, cracks, unfinished edges and areas hidden behind or beneath furniture.
• Locations where you have found pellets, wings or unexplained damage.

Record the room and exact position of each clue. Photograph the material beside an object for scale, and note whether the evidence returns after the area is cleaned. Don’t pull apart a wall, drill into a beam or remove a large section of timber just to look for galleries. In addition to risking damage, a small inspection opening may not reveal the full extent of an infestation.

In New Zealand, or anywhere that local termite species differ from those covered in general online guides, ask a local pest professional to confirm the identification. If the insect appears unusual or potentially introduced, ask whether the finding should be referred to Biosecurity New Zealand.

What should you do if you suspect an infestation?

1. Keep a record of the evidence. Photograph pellets, holes, wings and damaged wood. Note the date and location, and keep a sample if you can collect it without disturbing the timber.
2. Limit disturbance. Avoid spraying household insecticide into holes, sanding the area, sealing openings or replacing timber before an inspection. A surface product may not reach termites hidden deeper inside wood, and altering the evidence can make diagnosis harder.
3. Arrange an inspection. Choose a pest professional who can explain how they will identify the insect, inspect adjacent timber and determine whether activity is current. Ask whether the inspection covers the whole structure or only the area you reported.
4. Request a written treatment recommendation. It should describe the suspected species, affected areas, proposed method, what the method can and cannot reach, and whether follow-up is recommended.
5. Deal with damaged timber after the pest plan is clear. Replacement or repair may be needed for weakened wood, but repairs alone do not necessarily eliminate an active colony elsewhere.

A single pile of pellets does not automatically mean the whole building needs treatment. Equally, removing the visible pellets does not resolve the question of whether termites remain inside the wood. Inspection helps distinguish old evidence from a continuing problem and gives you a basis for comparing options.

How are drywood termites treated?

The appropriate treatment depends on how many areas are affected, whether the colony can be located, how accessible the timber is and what methods are available locally. Ask the provider to explain why the recommendation suits the evidence in your home. A method that treats one accessible section may not reach a separate, hidden colony.

Professional options may include targeted applications, heat treatment or fumigation, depending on the building, the suspected species and local availability. These approaches are not interchangeable. For example, a localised application is less disruptive but depends on reaching the infested area; a whole-structure method is broader but may require more preparation and temporary arrangements for occupants. Ask the provider to spell out what must be removed or protected, how long the property will be inaccessible if applicable, and what the treatment does not cover.

Be cautious about do-it-yourself sprays or products applied to the surface of timber. Drywood termites are concealed, so treating a visible hole does not necessarily reach the colony. Don’t use a pesticide unless its label specifically permits the intended use and you can follow all safety directions; when the pest has not been identified, professional assessment is the safer first decision.

What affects the cost of inspection and treatment?

There is no reliable single price for treating drywood termites without knowing the property and the extent of activity. Costs can depend on the inspection scope, access to affected areas, the amount and location of damaged timber, the chosen treatment, preparation requirements and whether follow-up visits or repairs are included. A quote for one accessible item of furniture is not directly comparable with a proposal for a whole building.

Ask for an itemised written estimate that separates inspection, treatment, preparation, repairs and follow-up where possible. Check whether the quote covers only visible evidence or also adjacent areas, what would trigger an additional charge, and whether any warranty has limits or exclusions. If you compare providers, give each the same description and photographs so their recommendations address the same problem.

Can you prevent drywood termites?

Prevention can reduce opportunities for termites to enter or remain unnoticed, but no housekeeping step guarantees that wood is protected. Unlike strategies aimed at subterranean termites, simply reducing moisture around a building does not eliminate the risk from drywood termites, which can live within timber without a soil connection.

• Inspect second-hand furniture, reclaimed wood and other timber items before bringing them indoors, especially if you notice pellets, holes or wings.
• Keep exposed timber in good condition and repair gaps or damaged finishes where practical; protective coatings do not prove that wood beneath them is pest-free.
• Make accessible timber easy to inspect by avoiding long-term storage that blocks frames, beams or furniture edges.
• Pay attention to recurring pellets or new holes rather than relying on a one-time visual check.
• Arrange an assessment if you find several signs, repeated evidence or damage in structural timber.

Firewood or stored wood should not be treated as the only likely source of an infestation, and moving an item does not confirm that termites have been contained. If suspect timber is portable, ask the inspector how to handle it before carrying it through the building or discarding it.

Frequently Asked Questions

Can drywood termites be present without visible pellets?

Yes. Termites can remain inside wood, and their openings or pellets may be concealed, overlooked or outside the area you have checked. A lack of visible pellets does not rule out an infestation if other signs or unexplained timber damage are present.

Do drywood termite pellets always mean the colony is active?

No. Pellets may be old, and they can remain after activity has stopped or treatment has taken place. Record where you found them and ask an inspector to assess them alongside the timber and any other evidence.

Are drywood termites the same as subterranean termites?

No. Drywood termites live within wood and do not need a soil connection, while subterranean termites generally depend on soil or another protected moisture route. Their signs and suitable treatments can differ, so identification should come before treatment planning.

Will replacing damaged wood solve the problem?

It may remove an affected piece, but it will not necessarily address termites in nearby or concealed timber. Have the extent of activity assessed before deciding whether repairs alone are sufficient.

Should I clean up the pellets before an inspection?

Take photographs and note the location first. You can leave the evidence in place for the inspector, or, if it is in the way, retain a small sample and record where it came from; avoid sealing or painting over nearby openings.

When should I call a pest professional?

Arrange an inspection if pellets recur, you find termite-like wings or openings, or timber appears weakened without a clear explanation. Seek advice promptly when the affected wood may be structural, since an inspection can help determine both the extent of damage and the appropriate next step.

For suspected drywood termites, the useful first move is to preserve the clues and confirm the pest before selecting a treatment. A clear inspection report can show whether the evidence is old or active, which timber is affected and whether localised work is reasonable or a broader approach is needed.