Textile insect · Anthrenus verbasci · Last updated 14 August 2026
Carpet beetles
The varied carpet beetle (Anthrenus verbasci) is a small beetle of 2 to 3 mm. The adult, harmless, is drawn to light; it's the hairy larvae that devour wool, silk, leather, furs, feathers and taxidermy collections.
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The carpet beetle lays in carpets, under furniture, in ducts and old bird nests. Its 'woolly bear' larvae feed on keratin: carpets, woollens, felts, but also dry goods and dead insects. The damage — scattered, irregular holes — is often mistaken for moth damage. Especially common in homes, museums and storage facilities, the larvae hide in dark, undisturbed areas. Treatment combines deep cleaning, targeted insecticide treatment of egg-laying areas and removal of the sources (old nests, feathers, forgotten woollens).
Identify
Signs of infestation
- Oval larvae, 4 to 7 mm, covered in thick brown hairs (carpet beetle larvae, or 'woolly bears') in carpet fibres or upholstered furniture
- Irregular damage on the edges and underside of natural-fibre carpets, often in rarely disturbed areas
- Adults (2 to 3 mm, mottled white-black-red) seen on flowers or windows in spring
- Shed larval skins in dark corners, behind radiators and under furniture
Where it's found
The varied carpet beetle (Anthrenus verbasci) first develops in bird nests in the roof (its natural primary habitat). Adults enter through windows in spring and lay eggs in undisturbed areas. Damage appears on the edges of wool carpets, under sofas, and in stored natural-fibre and hide collections.
Impact
Associated risks
Textile damage
Larvae cut through wool, cotton, fur and feather fibres in a pattern that looks like wear but always follows dark, undisturbed areas. Antique carpets and museum collections are especially vulnerable.
Bird nest source
Without removing the bird nest in the roof or gutter (the primary habitat), any indoor treatment is only temporary. Adults re-colonise the building every spring.
Good practice
Prevention
- 01Remove bird nests from gutters and roof vents (the primary habitat of carpet beetles)
- 02Vacuum under and behind all large furniture at least twice a year, including carpet edges
- 03Place pheromone traps in March-April to detect adults before egg-laying
Frequently asked questions
What you're asking
Carpet beetle or moth: how do I tell the difference?
The carpet beetle is a beetle: the adult is a small round, mottled beetle, the larva is stocky and covered in hairs. The moth is a winged insect. Carpet beetles leave scattered holes all over, including in carpets and woollens on the floor, while moths concentrate their damage in wardrobes. Small hairy larvae confirm the carpet beetle.
Where do carpet beetles lay their eggs?
In dark, undisturbed areas: under skirting boards and carpets, behind wardrobes, in ventilation ducts, and frequently in old bird or wasp nests in the roof. These nests are an infestation source that must be removed to prevent recurrence.
How do I protect my clothes and carpets from carpet beetles?
Vacuum regularly under furniture and along skirting boards, clean or freeze stored items, keep woollens and furs in airtight covers, and remove old bird nests from the roof. As soon as damage is visible, professional treatment of the egg-laying areas is needed because the larvae resist surface treatments.
Insect Control
Related pests
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