Carpet beetles in rugs: signs, larvae, and prevention

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University extension services say carpet beetle larvae feed on wool and other animal fibers, so a wool rug can be food for them. They say control starts with finding where the larvae feed, then cleaning and vacuuming. This guide covers the signs, the larvae, prevention, and when to call a professional.

What is a carpet beetle?

University of Florida IFAS Extension says carpet beetles belong to the family Dermestidae. The University of California Statewide IPM Program (UC IPM) says adults are small and round, with short antennae, and measure between 1/10 and 1/8 inch. It says they "range in color from black to a mix of white, brown, and yellow, depending on the species and age."

The University of Maryland Extension says adult carpet beetles do not damage fabrics. It says the damage comes from the larva, the immature stage.

What do carpet beetle larvae look like?

UC IPM says the larvae are a little longer than the adults and "look like fuzzy or hairy maggots." The University of Maryland Extension describes two kinds. It says the larva of the varied carpet beetle is shaped like a teardrop, with rows of light brown hairs. It says the black carpet beetle larva is 3 to 7 mm long and shaped like a carrot, covered in golden brown hairs, with a "tail" of long hairs at its rear end.

UC IPM says the larvae prefer dark, secluded places.

What signs do they leave in a rug?

UC IPM says carpet beetle larvae do not spin webs the way clothes moths do. Instead, it says, their shed skins and fecal pellets show where they have been feeding, and it describes the pellets as "about the size of a grain of salt."

UC IPM says carpet beetles tend to damage a large area in one part of a carpet, while moth damage "more often appears as scattered holes." It says the larvae leave "brown, shell-like, bristly-looking cast skins" when they molt.

UC IPM says: "A few adult beetles indoors should not be cause for alarm." It says to act once larvae turn up developing in fabrics or other parts of the home.

Where in a rug do they hide?

The University of Maryland Extension says the larvae "are usually found in concealed locations along baseboards, under large pieces of furniture, or in little used drawers or storage areas." UF/IFAS Extension says they tend to avoid light and feed in dark cracks, crevices, or folds.

UC IPM says to check carpet under heavy furniture and at its edges. For an area rug, we read that as the parts under a sofa, bed, or chest, the edges, and the back of the rug. The Canadian Conservation Institute (CCI) says the back of a rug, the underlay, and the floor itself should be vacuumed from time to time as well.

Which rug fibers do they eat?

UC IPM says the larvae feed on wool, silk, leather, fur, pet hair, feathers, and other animal products. It says: "They don't feed on synthetic fibers." The University of Maryland Extension adds a caution. It says they can feed in wool and synthetic blends, or on synthetic fabric with urine or sweat stains.

UF/IFAS Extension says synthetic items resist attack, though blends of natural and synthetic fibers can still be damaged. Read the fiber content label to see what your rug is made of. Our rug labels guide explains what the label must show.

How do you keep carpet beetles out?

UC IPM lists these steps, among others:

• Check window screens, doors, and vents for gaps or holes.
• Look over cut flowers for beetles before you bring them inside.
• Clean up lint, hair, and dead insects, and remove old spider webs.
• Keep items that are free of pests in airtight containers.

The University of Maryland Extension stresses sanitation. It says to vacuum carpeting thoroughly, along baseboards, under furniture, and in closets, and to empty the vacuum bag outdoors. Washington State University says sanitation and finding and removing the source of an infestation are the only long-term controls.

What if you find larvae in a rug?

UC IPM says frequent, thorough vacuuming removes food sources along with carpet beetle eggs, larvae, and adults. It says to get rid of the vacuum bag promptly after vacuuming infested areas, because it can hold eggs, larvae, or adults. It also says to throw out badly infested items.

For rugs, UC IPM says a dry cleaner that handles rugs can take an area rug. It says that if you are concerned a spray could damage an expensive rug, you should "hire an experienced pest control operator or carpet-cleaning company."

UC IPM says insecticides may not be needed when food sources are removed and areas are kept clean. We do not name or recommend any insecticide. If you use one, the extension sources say to read and follow its label.

When should you call a professional?

The sources point to a professional in these cases:

• Washington State University says: "If pesticide applications must be made, contact a pest management professional."
• Penn State Extension says some carpet beetles feed on dead insects, such as lady beetles or cluster flies that spend the winter trapped in walls, ceilings, and attics. It says homes with a yearly problem from an overwintering insect should contact a professional pest control company.
• UC IPM says fumigants are limited to licensed pest control operators.

Do carpet beetles bite?

None of the extension pages we use says carpet beetles bite. Penn State Extension describes something else: an allergic reaction to the hairs of carpet beetle larvae. It says these reactions are marked by "complaints of being bitten by something causing an intense itching and rash."

We give no medical advice. If you have a rash, itching, or other symptoms, talk to a doctor.

Sources: UC Statewide IPM Program, Carpet Beetles; University of Maryland Extension, Carpet Beetles; UF/IFAS Extension, Carpet Beetles (ENY-204); Washington State University Pestsense, Carpet beetles; Penn State Extension, Carpet Beetle Dermatitis; Canadian Conservation Institute, Basic care: Carpets and rugs; The George Washington University Museum and The Textile Museum, Caring for Textiles.

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