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Carpet Beetle Identification
Several species of Carpet Beetles may damage fabrics. Four species are most commonly
encountered-the black carpet beetle, varied carpet beetle, common carpet beetle, and
furniture carpet beetle. Together, this group is usually considered more economically
important as fabric pests than the clothes moths.

Varied Carpet Beetle (Adult)
Many other common beetles resemble adult and larval carpet beetles. The hide beetles
(discussed later ), museum beetles, bird nest carpet beetles, and cabinet beetles all have
a somewhat similar appearance. Although both adults and larvae may be mistaken for carpet
beetles, close attention to the descriptions of the carpet beetles, together with an
understanding of the larval habits, will usually allow proper identification.
These beetles all have a complete metamorphosis, that is egg, larva, pupa and
adult - the same life cycle as a butterfly - with the larva being the only stage that
causes damage to fabrics. All of the adults are small and inconspicuous beetles which are
rarely seen by homeowners. Adults may be found indoors or outdoors, and frequently on
flowers surrounding a house where they feed on pollen. Flowering shrubs such as Spirea and
Pyracantha are particularly attractive to adult carpet beetles, but other species of
flowering plants may be visited.
BLACK CARPET BEETLE
This as the most abundant and widespread of the carpet beetles and is the species which
causes the greatest damage to fabrics and other keratin containing articles throughout most
of the United States.
Adults are shiny black with brownish legs, and grow to a length of 1/8- to 3/ 16-inch.
They are frequently found outdoors in flowers and are most numerous in the spring and
early summer. They lay eggs either indoors or outdoors, beginning 4 to 8 days after the
adult emerges. Each female lays approximately 50 eggs over a period of about 3 weeks,
after which she dies. Indoors, these eggs are deposited in accumulations of lint, in air
ducts, underneath baseboards and other similar places. Eggs hatch in 6 to 11 days in warm
weather.

Black Carpet Beetle Adult (Actual Size - 1/8 inch - 5mm)
Larvae are quite tiny when they hatch, but have the same distinctive elongated carrot- or cigar-shaped bodies and long, brushy tail bristles which are so easily seen on the larger larvae. Body color varies from a light brown to almost black. They can develop under a wide range of temperatures and humidity conditions, and are much less susceptible to environmental changes than are clothes moths. Larvae may grow to 1/2-inch long over a series of 5 to 11 molts. They tend to avoid lighted areas, so are found most frequently in the lower parts of clothes closets, rolled up or wrapped into woolen materials, at the edge of carpeting under baseboards, or inside upholstered furniture. Mature larvae can wander rather widely, so may be found anywhere in a building. It is not at all unusual to find them in a bathtub, kitchen sink, or even crawling on walls and ceilings.

Black Carpet Beetle Larvea (Actual Size 1/4 inch - 7-8mm)
Black carpet beetle larvae are general feeders, feeding on dead animal materials, hair,
fur, hides
and horns, as well as the usual woolen products and many plant materials such as cereals,
stored grain or nuts. They tend to be surface feeders on wool, usually eating the nap from
fabric and leaving the base threads relatively unaffected. However, they are quite capable
of eating large, irregular holes through any suitable food material. In fur, hairs are cut
at the base with no injury to the hide. The hair then readily drops out leaving a bare
appearance to the hide. Black carpet beetle larvae frequently burrow through containers to
obtain food, leaving small openings through which other insects may enter to cause
additional damage. Cast skins and frass in the form of minute, irregular pellets are
frequently found on infested fabrics.
Black carpet beetle larvae may live as short as 9 months to as long as 3 years, depending
on their diet and environmental conditions. Larvae pupate in the last larval skin, with
the pupal state lasting from 6 to 24 days.
VARIED CARPET BEETLE
The varied carpet beetle is widely distributed in the United States. Adults are much
smaller than the black carpet beetle. Their body shape is more rounded when viewed from
above and they have a pattern of white, brown and yellow scales on the upper surface of
their wing covers or elytra.

Adult Varied Carpet Beetle (Actual Size 1/8 inch - 5mm)
Eggs are laid in various locations, where they hatch in 17 to 18 days. Larvae molt 7 or 8 times over about 7 to 11 months. Mature larvae are rarely more than 1/4-inch long and bear three pairs of hair tufts on the back end of the abdomen. The hairs in these tufts are shaped like arrow heads. These hairs can be irritating to the skin, or if breathed into the nose or lungs. The larvea is rather wide in proportion to its length and is usually broader at the back than at the front.

Varied Carpet Beetle Larvae and
Adults damaging Fabric
Varied carpet beetle larvae are scavengers. They are quite common in nests of birds and spiders, on dead animals and in insect collections. They feed on a variety of animal products such as woolens, carpets, hides, feathers, horns, bone and insect pupae; as well as on plant products such as rye meal, corn, red pepper and other similar materials. Pupae take 10 to 13 days to develop into adults.

Varied Carpet Beetle Larva (Actual Size 1/4 inch - 8mm)
COMMON CARPET BEETLE
Adults of this carpet beetle are small, rounded, gray to blackish in color with a
varied pattern of white and orange scales on the back. There is an orange-red band of
scales down the middle of the back. Adult beetles feed on nectar and pollen in flowers.
Each female deposits 30 to 40 small, white eggs which hatch in 10 to 20 days.
Larvae are rather active, frequently moving about rapidly. Their body is an elongated,
oval shape, and rarely more than 1/4-inch long. They are reddish-brown and covered with
numerous black or brown hairs. There is an average of six molts over a period of 60 to 70
days, after which pupation occurs in the last larval skin. The pupal stage lasts for 12 to
15 days, but the beetle typically remains in the old larval skin for approximately 18 days
before becoming active.
Larvae of this beetle often attack carpets; but also eat other woolens, furs, feathers,
silk, museum specimens and similar materials.
FURNITURE CARPET BEETLE
This beetle often attacks upholstered furniture. Adults are small, rounded and
blackish, with a mottling of yellow and white scales on the back and a heavy coating of
yellow scales on the legs. The color pattern varies considerably. In some
specimens the yellow scales are darker and more numerous, while in others the white scales
predominate.

Adult Furniture Carpet Beetle (Actual Size 1/8 inch - 5mm)
Females lay a total of 35 to 100 eggs in one to three batches. At room temperature
these hatch in approximately 3 weeks. Larvae then develop through 6 to 12 molts over a
period of 3 to 6 months. They are oval-shaped, somewhat elongated and thickly covered with
brownish hairs.
The pupa is white and develops in the last larval skin. At room temperature, the pupal
stage lasts from 14 to 19 days. The adult remains in the pupal skin for 1 to 10 weeks
before becoming active.
Furniture carpet beetles are found frequently on furniture where they feed on hair,
padding, feathers and woolen upholstering. They commonly feed on other woolens, carpets,
fur, bristles, horns, silk and other such materials. They will also feed on such fibers as
linen, cotton, rayon and jute when these are stained with animal body oils or other
soilage.
ODD BEETLE
This insect has been called the "tissue paper bug" but this in an unfortunate
misnomer. It is rather closely related to the carpet beetles, but the general
appearance of the adult would hardly suggest such a relationship. Adult males
have a long, narrow body with long legs and antennae sharply with the
rather oval body and shortened appendages of the typical carpet beetle. The
male is yellowish-brown with a moderately dense covering of hair on the body.
When at rest over the body, the wing covers touch each other on the inner
margin for only a short distance and then separate noticeably toward the tips.
Adult male (right) and female odd beetles.
The female lacks wings and has the
appearance of a larval form. However,
odd beetle larvae are similar in
appearance to the carpet beetles.
Adult females do not even look like a beetle in general body form. The body is broader and
more stout than the male, and there are no wings. The antennae are thin and about twice as
long as the head is wide. There is a median ocellus between the rather small compound
eyes.
Odd beetle larvae are rather similar in appearance to those of the other carpet beetles,
but do not have long hairs at the tip of the abdomen nor on the upper surface of the body.
However, there is a row of coarse, stout bristles across the top rear edge of each body
segment, and those hairs on the rear edge of the thorax are distinctly club shaped. The
larva tends to roll up in a ball when disturbed, another characteristic which will aid
identification.
These insects attack dry animal matter and will feed readily on woolen cloth. They have
also been known to damage silk.
The odd beetle is an introduced species. Since adult females are wingless, dispersal of
the species depends primarily upon its being carried from place to place in moving and
commerce. This insect has been found in situations which seem to be remote from its normal
food.
Control methods for the odd beetle are similar to those used for carpet beetles.
Hide Beetles
There are several species hide beetles that are considered fabric pests since
they can be found in tanneries and warehouses which process hides and skin. They can also
be found in homes attacking furs, animal skins, feathers, and meats or cheeses. The three
most economically important hide beetles are the larder
beetle, the black larder beetle, and the hide or leather beetle. These beetles
occasionally invade homes and infest other products of an animal base. They are also found
in birds' nests, attacking dead bird or mouse carcasses in attics, in museum collections
of stuffed animals or in beehives, where dead bees and wax are eaten. Both the adults and
larvae damage materials during feeding.
The female beetle must feed before laying eggs. Eggs are about 1/12 inch in length and are
laid in foodstuffs such as hides and other dry animal matter. Egg laying continues for 2-3
months, and the total number laid varies from 200 to 800. Larvae begin to feed soon after
hatching. They are active and relatively agile in dark areas, but in the light they may
become immobile. There are normally five or six larval molts. The fully grown larva
measures about 1/2 inch in length. The larva wanders when it matures, seeking a pupation
site. It may burrow into such materials as wood or other soft substrates before pupating.
The final larval skin acts as a plug protecting the pupa from predaceous insects. If the
larva is unable to bore a tunnel, the skin remains attached to the pupa.
Carpet Beetle Management
Fabric pest detection requires a thorough knowledge of pest biology and behavior.
Be sure to know where pet foods,
mounted animal specimens, insect collections, skins, furs, woolens, seeds, organic
fertilizers (e.g., bone meals) and other items likely to be infested are stored.
You also need to know if there are bird nests under eaves or in the attic, or if there are any wasp or
hornet nests around. By knowing the answers to these questions, you can save a great deal
of time.
INSPECTION
You should make a thorough inspection of infested premises to find all sources
of infestation before making any attempt at control. It is important to
remember that adults of these insects do not feed on woolens or on any of the
other materials which may be attacked by the larvae. The presence of adults in
an area does not necessarily mean that larvae are in the same area, since the adults may have already laid their
eggs in some other room and may be moving around at random or orienting towards bright
sunlight shining through windows (they will want to disperse to outdoor areas).
Clothes moth and carpet beetle larvae prefer to feed in secluded and protected places.
When searching for them, a good flashlight and a knife, nail file or small spatula are
essential tools. Larvae will usually be found in dark clothes closets, on furs, woolens,
hair padding, bits of carpeting, or other such materials in storage. They are also found
in lint, especially under baseboards and around door casings, under the edges of
carpeting, in and under upholstered furniture, in collections of animal hair, in air
ducts, occasionally in cereals in the kitchen or pantry, and anywhere else where suitable
food material might be available. When inspecting for carpet beetle larvae, be especially
careful to examine under baseboards, around the bottoms of door casings, under the edges
of carpeting, and in closets. Use the knife blade or other implement to bring out bits of
lint which are usually found in these areas, and examine them closely for live larvae or
their cast skins. Cast skins are sometimes more numerous than live larvae, but they
resemble live larvae so closely that they can be used for identification purposes. Use a
flashlight when examining dark closets and other such places.
In addition to the above-mentioned sources, it is very important that certain natural
sources of infestation be considered. Look for articles of woolen clothing which may have
been stored and neglected, and check the premises for old furniture and rugs which may be
a source of continuing infestation. Other important reservoirs which are often overlooked
include sites which represent the natural habitat of these insects. Sparrow, starling, or
other bird nests, inside or outside of the premises, are common points of origin (or
continuation) for fabric pest infestations. Wasp nests which are found under eaves and in
attics are also common sources of carpet beetle and clothes moth infestations. Moth or
beetle larvae feed upon the remainders of dead insects fed to the wasp larvae, on cast
wasp larval skins and sometimes upon the living wasp larvae. Another important reservoir
of food material for carpet beetle and clothes moth larvae is accumulations of animal hair
which may be found quite often in homes where pets are kept. Shed hair may accumulate in
heating ducts, beneath furniture, or in hard-to-clean corners. These loose tangles of hair
may be sufficient to sustain a small population of fabric pests for a long period of time,
even in places where all wool products might have been treated.
Clothes moth and carpet fabric pest detection requires a thorough knowledge of pest biology and behavior.
Observation can also be a source of useful information, as you will know where pet
foods, mounted animal specimens, insect collections, skins, furs, woolens, seeds, organic
fertilizers (e.g., bone meals) and other items likely to be infested are stored. They may
also know if there are bird nests under eaves or in the attic, or if there are any wasp or
hornet nests around.
SANITATION AND PREVENTION
Preventive measures should be practiced whenever possible, because once a "hole"
is made the damage is done and may not be repairable. Preventive procedures include
preventive sanitation and related chemical measures, and protection by mothproofing of
garments or fabrics. Much can be done to prevent fabric pest problems by means of
household cleanliness, including thorough and frequent cleaning of carpeting and
upholstery with a vacuum cleaner, and brushing, airing, and dry cleaning of susceptible
clothing or other articles. Avoid prolonged storage of discarded garments, bedding, any
fur or animal pelts (unprotected taxidermy) and old wool rugs or furniture
upholstered with vulnerable fabrics. Remember that a clean environment is not conducive to
activity of fabric-destroying insects. It is not absolutely necessary that the item itself
support fabric insect development. Soiled articles of otherwise indigestible materials can
be attacked, or garments of wool blend fabrics can be attacked. In all moth and carpet
beetle control work, it is essential to eliminate as many potential breeding places as
possible. Old pieces of woolen fabric, cut off pieces of carpeting, old feather pillows,
dried flower arrangements or "shadow boxes" (with caches of seeds in them)
and other such sources of fabric insect food should be destroyed. Areas under
baseboards, behind door casings, under heat radiators, and inside furnace or air
conditioning registers should be thoroughly cleaned with a vacuum cleaner to remove as
much lint as possible. A vacuum cleaner with strong suction is a good piece of special
equipment to use. Careful, routine attention to
such sanitation procedures, will be very beneficial toward limiting fabric insect
problems.
Several preventive approaches can be used in close association with these sanitation
procedures. The most commonly recommended chemical for preventive control in storage
situations is
Insect Guard which acts as a repellent and continuous fumigant. Stored woolens
should be interspaced with crystals of this material which have been wrapped in clean
paper, as the fabrics are packed into tightly sealed trunks or boxes. Use of tight
containers such as large, sealed plastic bags, which are then kept in tight boxes or
chests, is important toward obtaining optimum protection for the longest possible time.
Remember that it is important to maintain the highest possible concentration of the
Insect Guard vapors inside the plastic bag containing the susceptible items.
Naphthalene (moth balls),
are less desirable to use, and are also less effective. Cedar closets and most
cedar chests are ineffective, primarily because a sufficiently tight seal is rarely
maintained. Garment storage in cold vaults is an effective preventive measure, especially
for very valuable furs or other susceptible garments.
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DIRECT
FABRIC PROTECTION |
CONTROLLING EXISTING CARPET BEETLE INFESTATIONS
When infestations of clothes moths or carpet beetles are encountered, a rather extensive program of insecticide applications will usually be necessary after appropriate sanitation has been implemented. Spray insecticides such as Suspend, Demand, Demon WP, Tempo and various non-residual materials such as V One Pyrethrum are recommended for spot treatment or more general applications, as necessary. Residual sprays are generally applied with a hand sprayer, using a fine fan-spray nozzle.
Critical areas of infestation, usually identified during the inspection process, should receive special attention. In carpets, this would be around baseboard areas and under furniture. In furniture, this would be around seams, buttons, other cracks and crevices and padding areas.
All insecticides should be applied as a rather fine wet spray, directly to material being treated. Applications to upholstery fabrics should be made lightly, moving rapidly while spraying. Do not soak the fabric, because this will frequently result in staining not caused by the pesticide but caused by the water.
When treating carpets, be careful to prevent staining or soiling. If possible, the carpet should be cleaned before insecticide treatment. Be very careful not to soil the treated carpet with dirt from shoes or other sources, and try not to walk on treated areas until after they have thoroughly dried.
Whenever possible, it will be best to remove all furniture from a room which is to be treated. This may not be possible due to the size and weight of the furniture involved, or lack of space to put it elsewhere. Furniture can be moved and the carpeting under it treated, after which it can be replaced in its original location. When placing furniture on treated carpet, be sure to place some kind of temporary pad under the casters or skids on the bottom, as well as entirely underneath any other wood or metal articles which may touch the carpet. Failure to do this may result in the formation of rust marks on the carpet from metal parts, or stain marks from the wooden portions of furniture. Both types of stain are almost impossible to remove and can result in costly damage claims. Corrugated cardboard, cut into strips or squares, makes good padding for this purpose, as do folded paper towels, or small paper plates can also be used. The pads should not be removed until the carpet is thoroughly dry, usually after 2 or 3 days.
Regardless of the insecticide being used, be sure to keep small children and pets away from treated furniture and carpeting until they are thoroughly dry. These chemicals may be hazardous while they are wet. Check the insecticide product label for any other caution statements which may apply to this use.
These residual chemicals are all removed to some extent by subsequent washing, vacuuming and dry cleaning. The insecticide manufacturer's recommendations about length of control and re-treatment intervals should always be observed.
If furniture is infested, it may be necessary to open cushions or to remove the covering from the bottom of sofas or chairs, so the padding will be exposed. Special attention should be given to the padding inside upholstered furniture, which may be composed of feathers or horsehair (especially in antique furniture) and is susceptible to insect damage. Exposed padding can then be treated with sprays which will not harm the padding, or it can be thoroughly dusted with a suitable dust such as Drione Dust. Dust applications are generally preferred for this situation, because there will be no drying time required and dusts usually give long residual control. Dusts should not be used where subsequent contact with skin or clothing can be expected, so exposed upholstery surfaces or carpeted areas on which people or pets will sit should not be dusted. When infestations are not heavy, non-residual or contact spray applications such as Demon WP will kill both exposed adults and larvae. These sprays should be applied closely to cracks and crevices with as much force as possible to drive the spray in deeply. An aerosol spray such as V One Pyrethrum is frequently effective in closets. With all such applications, care must be exercised to avoid staining of clothes, walls, or furniture.
Many professional pest companies prefer to apply a residual insecticide of Demon WP to all of the appropriate areas, and then follow up with an aerosol application of a non-residual insecticide such as V One Pyrethrum to assure complete control of adult or larval stages which may not be directly in the areas treated with the residual material. This dual application approach is especially appropriate when damage is extensive and widespread when many active adult insects have been seen in widely scattered areas of the premises; or during seasons when egg-laying is occurring in the area.
Recommended Carpet Beetle Control Products:
Indoors - Liquid sprays such as Suspend, Demand, Demon WP, Tempo to kill carpet beetle larvae and adults. All clothing made of natural animal fibers such as wool, cashmere, etc. must be carefully inspected for damaging larvae or dry cleaned since dry cleaning solutions will kill immature larvae. Wrapping inspected or cleaned clothes in plastic will help prevent infestation but is not a cure all.Insect Guard can be used as an effective storage control material. Mothproofing services provided by some Drycleaners can also aid in control.
Outdoors - Liquid spray applications to flowers or shrubs, such as Suspend, Demand, Demon WP, Tempo.
Application Dont's: Foggers will not work. Closets lined with cedar panels are of little or no use in carpet beetle control.
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