Carpet beetles are small and easy to overlook, but the larvae leave clear clues. Here is how to recognise the adults, the bristly young and the damage they cause.
Most people first notice carpet beetles through the larvae. They are small, brown and covered in bristly hairs, which is why they are often called woolly bears. They grow to roughly the size of a grain of rice, move slowly, and tend to hide in dark, undisturbed places such as the edges of fitted carpets, under heavy furniture and inside wardrobes.
The larvae are the stage that feeds. They eat natural materials, so wool, fur, feathers, silk and the dust and hair that collect in corners are all on the menu.
Adult carpet beetles are only a few millimetres long and rounded, a little like a tiny ladybird without the bright shell. The varied carpet beetle has a mottled pattern of white, brown and yellowish scales. Adults do not eat fabric. They feed on pollen and nectar, so you may find them on windowsills in spring and summer, trying to get outside to flowers.
Larvae shed their skins as they grow, and those pale, hollow, bristly husks are often the clearest proof. You may also find tiny grains of droppings near damaged fabric. Look at the following places first:
Carpet beetle damage tends to be irregular, with small holes or bare patches rather than the neat clusters of holes sometimes linked to clothes moths. On a carpet it often shows as a worn, thinning patch along an edge or beneath furniture. Because the larvae avoid light, the visible harm can lag well behind the infestation.
A few other things get mistaken for carpet beetles. Clothes moth larvae are pale and caterpillar-like, without the bristles. Small ladybirds are brighter and more domed. Booklice are pale and soft-bodied, and found where it is damp. If you are unsure, keep a cast skin or a live specimen in a sealed container, because a close look usually settles the question.
Adult carpet beetles tend to be seen in spring and early summer, when they emerge and look for light and flowers. Larvae, by contrast, can be active indoors all year because heated homes stay warm enough for them to keep feeding. This means you can find damage in winter with no adult in sight, and that a lone beetle in May may be the end of a cycle that began months earlier.
Larvae take a long time to mature in cool conditions, sometimes most of a year, so an infestation can build slowly and quietly. That slow pace is one reason people only notice when a favourite jumper or rug has already been marked.
If you have found beetles, larvae or damage and cannot be sure what is causing it, we can look at the evidence and survey the property. For homes and businesses in Leeds and West Yorkshire the survey is free. Call 0113 347 0014 or message us on WhatsApp and we will arrange a quote.
They do not carry disease or bite. The bristly hairs on larvae and cast skins can irritate sensitive skin in some people, causing itchy red marks that are sometimes mistaken for bites. The main harm is to fabrics, carpets, stored clothing and natural-fibre furnishings.
Adults feed on pollen and nectar, so they head for the light and for flowers. Seeing them indoors usually means they have emerged from larvae feeding somewhere in the property, or that they came in from outside on cut flowers or open windows.
Yes, by the larvae. Carpet beetle larvae are brown and bristly. Clothes moth larvae are pale and smooth, and often sit inside a silky case or webbing. The damage differs too, with beetles causing worn patches and moths leaving small holes.
Tell us what you have seen and where, and we will come back to you. There are no call-out charges and surveys are free for homes and businesses.
