Small, irregular holes in wool sweaters are almost always the work of clothes moth larvae, not the adult moths seen fluttering near a closet. Stopping the damage takes two separate jobs: killing the larvae already in clothing by freezing, hot washing, or dry cleaning, and then catching adult moths and changing how wool is stored so a new generation never gets started.
What Insect Actually Eats Holes in Wool Sweaters?
The damage comes from the larval stage of two species, the webbing clothes moth and the casemaking clothes moth, both small, buff coloured moths rarely longer than half a centimetre. Adults do not eat fabric at all; they live only long enough to mate and lay eggs, and the larvae that hatch feed on keratin, the protein in wool, silk, fur, and feathers. Larvae avoid light and are especially drawn to fabric carrying sweat or food stains, which is why holes usually show up first around the collar, underarms, or cuffs of a sweater stored unwashed.
Carpet beetles are sometimes blamed for the same damage, since their larvae also feed on wool. Carpet beetle larvae are bristly and oval rather than worm like, and they tend to leave scattered single holes rather than clustered ones, a difference that matters because clothes moth traps will not attract them.
How Can Larvae Already in a Sweater Be Killed?
Freezing kills clothes moths at every life stage, and a household freezer is cold enough when set to minus 20°C and left for one full week. Sealing the sweater in a plastic bag before it goes in keeps condensation on the outside of the bag, and leaving the bag closed for a day afterward lets the wool return to room temperature without dampness.
For garments that can be washed, laundering in hot water for 20 to 30 minutes kills eggs, larvae, and adults, while dry cleaning does the same job for wool that cannot go in a machine. Vacuuming closet corners, shelf edges, and the cracks under furniture with strong suction removes larvae and eggs that would otherwise reinfest clean clothing.
What Do Pheromone Traps Do, and Where Should They Go?
A pheromone trap uses a scent that mimics a female clothes moth to lure adult males onto a sticky surface, so it catches adults only and never the larvae doing the damage. That makes a trap a monitoring tool first: a trap that fills quickly is a sign larvae are feeding somewhere nearby, even before holes appear.
To confirm whether moths are active, placing a Terro Clothes Moth Trap in the closet where wool is stored gives an early warning that weeks of quiet feeding might otherwise hide. The flat, folded cardboard Biocare Clothes Moth Trap sits on a closet floor or shelf, while the triangular Aeroxon Clothes Moth Trap hangs among the garments themselves. Urban Nature Store carries both styles, so the choice usually comes down to the shape of the storage space.
Does Lavender Actually Keep Clothes Moths Away?
Lavender is a traditional moth deterrent, but there is little reliable evidence that its scent stops clothes moths from laying eggs, so it works best as a pleasant extra rather than a form of protection. Clean wool in sealed storage is what actually keeps larvae out.
Where the scent is wanted in a drawer, a Lavender Drawer Sachet tucked between folded sweaters adds fragrance to stored wool. Pairing it with a pheromone trap in the same closet keeps the monitoring job covered while the sachet handles the scent.
How Should Wool Be Stored to Prevent Another Infestation?
Washing or dry cleaning every sweater before it goes into seasonal storage removes the sweat and food residue that draw egg laying females in the first place. Folding clean wool into sealed plastic bins or zippered garment bags then shuts out any moth still active in the house.
Secondhand sweaters, vintage coats, and wool rugs brought in from storage are common sources of new infestations, and a week in the freezer before they join the rest of a wardrobe removes that risk. A pheromone trap left in the closet through the warm months, when sweaters sit unworn and unchecked, gives an early signal if a new generation starts.
Frequently Asked Questions
Do clothes moths only damage wool?
No. Clothes moth larvae feed on any material containing keratin, including silk, fur, feathers, and felt, though synthetic fabrics are rarely touched unless they are blended with natural fibres or heavily soiled.
Will an ordinary home freezer get cold enough?
Usually. Household chest freezers typically run between minus 18°C and minus 28°C, so a freezer thermometer confirms whether a particular unit reaches the minus 20°C a one week treatment needs.
Does one moth flying around the house mean there is an infestation?
Not necessarily a clothes moth infestation. Pantry moths are often mistaken for clothes moths, but a clothes moth that turns up indoors is a sign larvae are feeding somewhere nearby, usually in a dark, undisturbed spot.
Should mothballs be used instead?
Only in airtight containers. Mothballs are meant for sealed storage rather than open closets or drawers, and freezing, washing, and clean storage handle the same job without the fumes.
Is a sweater with moth holes still worth keeping?
It depends on the damage. Small holes near seams or cuffs can often be repaired by reweaving or visible mending, while a sweater with widespread scattered holes is usually judged by its value and overall condition.
