Adult Moths vs Carpet Moth Larvae - Which Actually Damages Carpets?

The Adult Cannot Feed

An adult clothes or carpet moth has vestigial mouthparts and takes little or no food. It exists to mate and lay eggs, and it lives a matter of weeks.

So the moth flying near your skirting board is doing no damage whatsoever to the carpet. It is a symptom and a signal, not the problem.

The Larva Does All of It

The larva is a smooth pale caterpillar, often inside or dragging a silky case the colour of the carpet it is eating. It has the enzymes to digest keratin — wool, silk, fur, feather — which very few insects can do.

It grazes the pile down towards the backing over weeks or months, staying in contact with the surface and away from disturbance. Everything you can see as damage was done by larvae.

Why Killing the Adults Achieves Almost Nothing

By the time you swat one, eggs have generally been laid already. A female lays over a period of days in the exact places you cannot easily reach: deep in the pile, along the gripper at the room edge, under the wardrobe.

Fly sprays, sticky traps and plug-ins all target adults. They will reduce what you see. They will not protect the carpet, and a house treated that way for a year usually has more damage at the end of it, not less.

What Seeing Adults Actually Tells You

That there is a breeding population, and roughly where. Adults are poor fliers and stay near where they emerged, so a moth consistently seen in the back bedroom means larvae in the back bedroom.

Pheromone traps are genuinely useful for this — not as a control, but as a way of finding out which room the problem is in before you start moving furniture.

So Where Should the Effort Go

At the larvae, in the places they can survive: under the beds, under and behind the sofa and wardrobe, the carpet edges over the gripper, wardrobe floors, and the carpet under any rug.

Treatment targets the same places, and it is £180 for the first room and £60 for each additional room. Between visits, the crevice tool along the room edges does more than any product aimed at the adults.