A bare patch tells you that fibers are missing. It does not, by itself, tell you whether anything is still feeding. That distinction decides whether you need pest control now or a repair decision later.
Look for the insect, not just the hole
Clothes-moth larvae damage wool rugs; the adults do not eat the pile. The University of California's clothes-moth guide describes two relevant species, the webbing and casemaking clothes moths. Their larvae favor dark, undisturbed parts of carpets, especially beneath furniture.
Inspect the damaged area in good light. Then lift the rug and check its reverse, edges and sections under furniture. Look for:
| Finding | What it suggests |
|---|---|
| Live cream-colored larvae, sometimes with a dark head | Current insect activity; identify the pest |
| Silken webbing or portable fiber-covered cases | Evidence consistent with clothes-moth larvae |
| New grazing and debris appearing after cleaning | Ongoing feeding is possible |
| A bare patch with no other evidence | Timing remains uncertain |
The pattern is helpful, not conclusive. Carpet beetle larvae also feed on animal-based textiles, and damage alone may not identify the pest. Collect a clear photo or specimen if you need a professional identification.
Make a baseline
Photograph the damaged area with a ruler, vacuum as the rug's construction allows, and inspect again over the following weeks. New feeding, larvae or new debris warrants action. A patch that appears unchanged still needs periodic checking; one quiet inspection cannot prove that every life stage is gone.
If you find live larvae
Act on the room and nearby textiles, not only the visible patch. Carefully vacuum the rug, its reverse if appropriate, the floor below it, skirting and undisturbed spaces. Empty the vacuum promptly. Inspect wool clothing, stored rugs and upholstery nearby. Launder or professionally clean affected pieces according to their care requirements. For a valuable rug, ask a specialist which treatment its dyes and construction can tolerate.
UC IPM lists laundering, dry cleaning, controlled freezing and other treatments, but temperature and exposure need to be suitable for the item. A household freezer or improvised heat treatment is not a universal guarantee and may harm a delicate rug. Follow an evidence-based protocol for the actual textile or use a professional.
Species-specific pheromone traps can help tell you whether adult clothes moths are still present. They catch males; they do not clear larvae already feeding. A trap for pantry moths also is not a clothes-moth monitor.
If the damage is old
Keep inspecting the rug and its surroundings, but turn your attention to whether repair is worthwhile. Hand-knotted pile may be reknotted; cost depends on the area and whether the foundation is damaged. Before placing another wool rug in the same spot or storing one, clean it and keep dark, undisturbed areas on the inspection schedule.
Common questions
Does a hole in a wool rug mean moths are still there?
No. A bare patch can be old damage. Inspect the area, underside, edges and places under furniture for live larvae, fresh webbing or cases. Photograph the patch and check whether it changes after cleaning and monitoring.
What is the strongest sign of an active infestation?
Finding live larvae on or near the affected textile is stronger evidence than finding an old hole or an adult moth elsewhere in the room. Carpet beetle larvae can also damage rugs, so identify the insect before choosing treatment.
Will a clothes-moth pheromone trap solve the problem?
No. A species-specific trap catches adult males and can help monitor activity, but it does not remove larvae feeding in the rug. Inspect and clean textiles and their surroundings, and seek professional help for a persistent problem.