Pest Control
Un-snug the bug in your rug: detecting and preventing carpet beetles
Small holes along a seam, bare patches at the edge of a rug, tiny hairy larvae on the skirting. Carpet beetles are common, and most of the fix is thorough cleaning.
Carpet beetles are one of the most common causes of damage to wool carpets, rugs and clothes in British homes. The adult beetles do no harm. It is their larvae, known as woolly bears, that eat natural fibres, and they can go unnoticed for months.
The short version
- The damage is done by the larvae, which feed on wool, fur, feathers, silk and leather, plus the fluff, hair and dead insects that collect in quiet corners.
- The usual signs are irregular holes, bare patches along carpet edges and small, empty, bristly skins.
- Thorough, repeated vacuuming and cleaning does most of the work. Treatment helps where an infestation is established.
What do carpet beetles look like?
Several species of carpet beetle live in the UK. By far the most common in homes is the varied carpet beetle. The adults are tiny, round beetles about 2 to 4mm long, mottled with brown, white and yellowish scales, a little like a very small ladybird with a patchwork pattern.
The larvae are what you are more likely to find. They are around 4 to 5mm long, carrot-shaped, banded brown and covered in bristly hairs, with a tuft of longer hairs at the tail end. That fuzzy look is why they are called woolly bears.
Signs of infestation
Despite the name, carpet beetles are a general textile pest rather than a carpet one. Look for:
- Holes and thin patches in wool carpets and rugs, especially along skirting boards and under furniture where the vacuum does not reach.
- Irregular holes in woollens, often along seams and folds of clothes that are stored rather than worn.
- Cast larval skins: small, light brown, bristly husks left behind as the larvae grow.
- Adult beetles on windowsills, because they are drawn to light when they are ready to leave and breed.
Natural, animal-based materials are the target. Cotton and synthetics are rarely eaten unless they are blended with wool or heavily soiled.
When to spot them
Adults are mostly seen from spring into early summer, often on windowsills, as they fly out to feed on pollen and nectar from garden flowers before coming back indoors to lay eggs. The larvae feed through the rest of the year, which is when the damage happens. In a warm, centrally heated home they can be active at almost any time.
Life cycle
Eggs are laid in or near a food source: a wool carpet, a drawer of jumpers, an old bird's nest in the loft. The larvae can take many months, sometimes more than a year, to reach adulthood, depending on temperature and food. They can also survive long spells without feeding, which is why a problem can reappear after it seemed to have gone.
Why are carpet beetles considered a pest?
Mainly for the damage. A small population left alone in a wool carpet or a wardrobe of stored clothing can ruin items of real value. Carpet beetles do not bite and do not spread disease, but the bristles on the larvae and their cast skins can irritate the skin of some people, causing an itchy rash. If you have an unexplained rash and are finding larvae, it is worth mentioning both to your GP.
Prevention is better than cure
- Vacuum thoroughly and often, paying attention to carpet edges, under beds and sofas, inside wardrobes and airing cupboards, and between floorboards. Empty the vacuum outside afterwards.
- Clean before you store. Wash or dry clean woollens before putting them away for the season, and store them in sealed bags or boxes.
- Treat items you suspect. Washing at 60°C kills all stages. Items that cannot be washed can be sealed in a bag and frozen for at least a week.
- Check the loft. Old birds' nests, wasp nests and dead insects are a common breeding source. Remove them.
- Turn out stored clothes every few months. Larvae prefer undisturbed fabric.
- Avoid old-fashioned mothballs. They do little in an open wardrobe and are not a substitute for cleaning.
When to call us
If you are still finding larvae after a thorough clean, or the damage is spreading across carpets or several rooms, the infestation is likely to be established in places you cannot reach, such as under fitted carpets or in floor voids. We identify the species, find where they are breeding, and apply a targeted residual treatment to the affected areas, alongside the cleaning that has to go with it. If you are not sure what you have found, a clear photo is usually enough for us to tell you.
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Read the guide →Not sure what you're looking at?
Send us a photo or describe it. We will tell you what it is, whether it needs treating at all, and what it would cost, before anyone comes out.