Carpet beetles: the larvae and their food source are the real problem

Adult beetles versus larvae

Adult carpet beetles can enter from outdoors and may gather at windows. The damaging stage is the larva. Larvae are often hairy or bristly and can feed on materials of animal origin such as wool, fur, feathers and accumulations of lint, hair or dead insects.

Signs of an indoor source

• Hairy larvae or shed larval skins in closets, drawers, baseboards or storage areas.
• Irregular damage to wool, fur, feathers or other susceptible natural-fiber items.
• Repeated adults emerging in the same room rather than one isolated visitor.
• Larvae around lint, pet hair, dead insects or animal material in quiet voids.

Where to inspect first

1. Closets and storage containing wool, felt, fur, feathers or rarely moved textiles.
2. Carpet edges, baseboards, vents and areas where lint and pet hair accumulate.
3. Under furniture and appliances where dead insects collect.
4. Attics, wall voids or other spaces if there may be an animal nest or dead insects supporting dermestid larvae.

Control the source

Vacuum lint, hair, shed skins and insects thoroughly. Clean or launder affected textiles using a method safe for the item, and store clean susceptible materials in sealed containers when practical. If a hidden animal or insect source is feeding the larvae, that source has to be removed for durable control.

Do not treat one adult as proof of infestation

University of Minnesota Extension notes that finding one or a small number of adult carpet beetles does not automatically indicate a problem. Escalate the inspection when you find larvae, repeated adults or material damage.