Case-bearing clothes moths: what you need to know

Written by Avon Pest ControlFirst published 16 April 2023Updated 9 November 2026

The case-bearing clothes moth is one of the two clothes moths that damage textiles in British homes. Its larvae spin a small, portable silk case and carry it with them as they feed on wool, silk and fur, which is the easiest way to tell it apart.

The short version

• The damage is done by the larvae, not the adult moths, and they feed on animal fibres such as wool, cashmere, silk, fur and feathers.
• Look for small holes, and for tiny tube-shaped cases stuck to fabric or tucked into carpet edges.
• Thorough cleaning, washing or freezing affected items, and good storage solve most problems. Treatment is for established infestations.

What is a case-bearing clothes moth?

The case-bearing clothes moth (Tinea pellionella) is less common in homes than its relative, the webbing clothes moth, but it causes the same kind of damage. Its larva spins a silk case around itself, often woven with fibres from whatever it is eating, so the case can be the same colour as the fabric. It moves around with its head and legs out of one end.

The adult is a small, narrow-winged moth about 1cm long, a dull silvery grey-brown with a few faint darker spots on the wings. It flies weakly and prefers to scuttle into dark folds rather than fly towards light.

Moth life cycle

• Eggs are tiny and white, laid on or near natural fibres, and hatch in one to a few weeks depending on temperature.
• Larvae are small, creamy white and caterpillar-like, living inside their cases. This is the feeding stage and can last from a couple of months to well over a year in cooler conditions.
• Pupae form inside the case, which is often attached to a wall, ceiling or the underside of furniture.
• Adults live for a few weeks. They do not feed on fabric. Their purpose is to mate and lay eggs.

Habitat

Outdoors, clothes moths live in birds' nests and animal debris. Indoors they have everything they need in wardrobes, drawers, under beds, behind furniture and in lofts where natural materials are stored. Central heating means they can stay active through the winter, so a problem can build steadily all year.

Feeding

The larvae digest keratin, the protein in wool, hair, fur and feathers. They particularly like fabric that is soiled with sweat, skin or food, which is why worn clothes put away unwashed are the most likely to be attacked. Synthetic fabrics and cotton are rarely eaten unless they are blended with wool or heavily soiled.

Infestation prevention

1. Vacuum thoroughly, including carpet edges, under furniture, inside wardrobes and drawers, and behind radiators. Empty the vacuum outside.
2. Wash or dry clean before storing. Clean woollens are far less attractive to moths, and washing at 60°C kills all stages.
3. Freeze what you cannot wash. Seal the item in a bag and freeze it for at least a week, then let it come back to room temperature slowly before unbagging.
4. Store in sealed bags or boxes, especially for seasonal clothes and blankets.
5. Check regularly. Take stored items out every few months, shake them out and look for cases and holes. Larvae prefer fabric that is never disturbed.
6. Use pheromone traps to monitor. They catch male moths and show where activity is, but they will not clear an infestation on their own.

Already found evidence of an infestation?

Start with the cleaning and the affected items above, because no treatment works if the larvae still have a food supply. If you are still finding cases, larvae or new damage after that, or the damage is in fitted carpets, the infestation is likely to be in places you cannot easily reach.

That is when to call us. We confirm whether it is a moth or carpet beetles, which are treated differently, find where they are breeding, and apply a targeted residual treatment to carpets, floor edges and storage areas where it is justified. We will tell you what to do with the affected textiles and how to keep them clear afterwards.

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