What does a carpet beetle look like?
The adult is small and round, about 2 to 3 mm long. One common type is dark with wavy white bands across its back. It's easy to take for a speck of dirt until it walks off.
The grub is the one to learn. It's a small hairy larva, bigger than the adult, and the hairs break off when it's handled. Empty hairy skins are one of the clearest signs you'll find.
Are carpet beetles in New Zealand?
Yes. A 2015 Massey University thesis says the species Anthrenocerus australis was introduced here and is now a pest of woollen carpets and fabrics. Auckland Museum counts the carpet beetle among the dermestids, a beetle family of over 700 species worldwide, and calls their larvae very destructive.
We haven't read a New Zealand source that lists every species here, so don't worry about naming yours. The signs and the fix are what matter.
Signs worth looking for
- Tiny beetles on window sills, often more than one.
- Empty hairy skins along skirting boards or under furniture.
- Bare patches in wool carpet, especially at the edges.
- Holes in wool, felt, fur or anything with feathers.
- Damage to stored things you haven't moved in a while.
Carpet beetle or clothes moth?
| Carpet beetle | Clothes moth | |
|---|---|---|
| What does the damage | A small hairy grub | A creamy white larva with a dark head |
| What it eats | Wool, feathers, silk and fur | Feathers, wool, hair and fur |
| What you'll notice | Tiny beetles on sills, hairy skins | Small moths that avoid light, little silk cases |
| Where to look | Carpet edges, under furniture, stored fabric | Wardrobes and drawers |
Why do they keep coming back?
Because the adults aren't really living with you. They spend most of their time outdoors on pollen and nectar, then fly in through windows and lay on anything woollen.
That's why a single indoor treatment doesn't close the door. You can deal with the grubs in your carpet, but new adults can still arrive.
Can they affect your health?
They don't bite, but the larval hairs can cause allergic reactions in some people. If you've got a rash you can't explain and you're finding these grubs, mention it to your doctor, or ring Healthline any time.
What you can do this weekend
You can
- Vacuum thoroughly and often, right along carpet edges and under furniture.
- Pull out the couch and any rugs that never move.
- Wash or dry clean woollens before you put them away.
- Store wool, fur and feathers in sealed bags or tubs.
- Check them every so often, and empty the vacuum outside.
Leave to a pest business
- Treating carpet or fabric if grubs keep turning up.
- Working out whether it's carpet beetle, clothes moth or both.
What we'd do about carpet beetles
We'd move the furniture, vacuum right to the skirting, and go through the wool that hasn't been touched in a while. Most of the answer is in that one job. If you're still finding grubs or fresh holes a few weeks later, tap Not sure what it is and mention carpet beetles.
Want someone to look at it?
Tell us what you've seen and your postcode, and a local pest business that handles exactly that calls you to talk it through.
