Moth damage is caused by larvae, not the adult moths you see flying around your home. The adults don’t eat at all. Instead, they lay eggs on materials their offspring can feed on, and the tiny caterpillars do all the destruction. Two types of moth damage are most common in homes: clothes moths eating through fabrics and pantry moths ruining stored food.
What Clothes Moth Damage Looks Like
Two species cause most fabric damage in North America: the webbing clothes moth and the casemaking clothes moth. Their larvae feed exclusively on animal fibers, including wool, silk, fur, feathers, felt, and leather. These materials contain keratin, a protein that the larvae can digest. Cotton, polyester, and other synthetic or plant-based fabrics are safe unless they’re blended with animal fibers or heavily soiled with food or sweat stains.
The damage itself appears as irregular holes, thinned patches, or surface grazing on fabrics. You won’t see the clean, round holes that people imagine. Instead, the eaten areas look ragged and uneven, often concentrated along seams, inside folds, and in pockets where the fabric is undisturbed and dark. Larvae avoid bright light and will drop from clothing when they can’t find a sheltered spot, so damage tends to cluster in hidden areas.
Each species leaves a different calling card. Webbing clothes moth larvae spin silken tubes and webs attached to the fabric they’re eating. Casemaking clothes moth larvae build portable protective cases out of pieces of whatever they’re feeding on, dragging these tiny tubes along as they move. Finding either silken webbing or small cigar-shaped cases on your fabrics is a sure sign of an active infestation, not just old damage.
How to Tell Moth Damage From Carpet Beetles
Carpet beetles cause similar destruction and are easily confused with clothes moths. The key differences come down to what the pests leave behind. Moth larvae produce silk: webbing, tubes, or portable cases depending on the species. Carpet beetle larvae produce neither. Instead, carpet beetle larvae shed their skins as they grow, leaving behind tiny husks that look like miniature versions of the larvae themselves. You’ll also find small fecal pellets near carpet beetle feeding sites.
If you see webbing on damaged fabric, you’re dealing with moths. If you find bristly shed skins or tiny dark droppings but no silk, carpet beetles are the culprit. The distinction matters because treatment strategies differ, especially when it comes to trap selection and where to focus your cleaning efforts.
Pantry Moth Damage in Stored Food
Pantry moths (most commonly the Indianmeal moth) target a completely different set of materials. Their larvae feed on cereal, grains, beans, nuts, flour, dried fruit, birdseed, dry pet food, spices, chocolate, and candy. The damage shows up as webbing, clumped grains or flour, and small holes chewed through plastic bags or thin cardboard. Larvae can chew through packaging, so even unopened products may be infested.
To check for pantry moth damage, pull interior bags out of boxes and roll them around, looking for clumps, silken threads, or webbing. Inspect the corners of boxes and creases of bags carefully. Any food with visible webbing, small fecal specks, or holes in the packaging should be discarded immediately. The larvae spin silk as they move, so sticky or clumpy texture in dry goods that should pour freely is a reliable warning sign.
Why Some Items Get Damaged and Others Don’t
Clothes moth larvae are strongly attracted to soiled fabrics. Items stained with food, perspiration, or body oils are far more likely to be targeted than clean ones. That favorite wool sweater you wore all winter and tossed in the back of the closet without washing is the most vulnerable item you own. Clean fabrics are significantly less appealing to egg-laying adults looking for a meal source for their offspring.
Damage also concentrates in dark, undisturbed spaces. A wool coat you wear regularly is at lower risk than one stored in a garment bag for years. Seasonal items packed away in boxes, rugs tucked under furniture, and blankets stacked on high shelves are prime targets precisely because no one is handling or inspecting them.
Killing Moth Larvae With Heat or Cold
Temperature is one of the most reliable ways to eliminate moth larvae, eggs, and adults from infested items. Laundering in water at least 120°F for 20 to 30 minutes kills all life stages. For items that can handle a dryer, a hot cycle achieves the same goal. Since many wool and silk garments can’t tolerate hot water, dry cleaning is often the only practical option for delicate pieces.
Freezing also works but requires patience. Place the item in a sealed plastic bag and leave it in a freezer set below 18°F for several days. This kills larvae and eggs embedded in the fabric. You can also heat items in an oven above 120°F for at least 30 minutes, though this is only practical for small, sturdy items that won’t be damaged by the heat.
A less common option is fumigation with dry ice. Place the item and a half-pound to one-pound piece of dry ice in a thick plastic bag (at least 4 mil thickness, about 30-gallon capacity). Seal the bag loosely until the dry ice fully evaporates, then tighten the seal and leave it for three to four days. The carbon dioxide displaces oxygen and suffocates the insects. Handle dry ice with gloves, never bare skin.
Prevention That Actually Works
The single most effective prevention step is cleaning garments before storing them. Moths are far less likely to lay eggs on fabrics free of food residue and body oils. Launder or dry clean everything before it goes into seasonal storage, then seal items in airtight containers. Airtight is the critical word here. Mothballs and chemical repellents only reach effective concentrations inside sealed containers. In an open closet, they barely repel adult moths and do nothing to stop larvae already present on your clothes.
For items you keep in regular rotation, periodic brushing helps. Brush garments thoroughly along seams, inside folds, and in pockets. This physically destroys eggs and exposes larvae to light, which they avoid. Hanging items in direct sunlight and brushing them down is a simple, chemical-free maintenance habit.
Natural repellents like lavender sachets and cedar blocks have a limited track record. They may mildly deter adult moths from landing, but they won’t kill larvae already feeding on your fabrics. One writer who tested lavender sachets, garment bags, and scented detergents found they couldn’t protect every natural fiber in the home. There was, as she put it, a constant buffet of fibers available to moths regardless of how many deterrents were in place.
Pheromone Traps for Monitoring and Control
Pheromone traps emit a synthetic version of the scent female moths release to attract males. Male moths fly to the trap and get stuck on a sticky surface, which disrupts the breeding cycle by reducing the number of males available to mate. These traps are species-specific, so you need the right type for clothes moths versus pantry moths.
Traps won’t eliminate an infestation on their own, but they’re effective at breaking the breeding cycle over time. In one documented case, traps placed at different heights on walls caught an average of 10 moths each within the first few weeks, and it took about two months to significantly reduce the population. Placing traps higher on walls in addition to lower positions helps catch moths that the lower traps miss.
One caution: pheromone traps can theoretically attract moths from outside your home, though the risk is small. They’re best used when you already know you have a moth problem, not as a preventive measure in a moth-free space.
When Professional Treatment Makes Sense
A small infestation caught early, a few holes in one sweater, some webbing in a single bag of flour, can usually be handled with thorough cleaning, temperature treatment, and traps. Large or persistent infestations are a different story. If you’re finding damage in multiple rooms, across different types of items, or the problem keeps returning after home treatment, professional pest control is worth considering.
Professionals typically start by identifying the exact species, since treatment differs between fabric-infesting and food-infesting moths. For clothes moths, technicians focus on closets, rugs, upholstered furniture, and stored linens. For pantry moths, treatment begins with discarding all contaminated food products, then treating cupboards and shelves. Methods can include pheromone traps for monitoring, growth regulators that prevent larvae from maturing into reproducing adults, and targeted residual treatments applied to cracks, crevices, baseboards, and storage areas. Larger or more established infestations typically require multiple visits.