Carpet beetles belong to the family Dermestidae and are found throughout Australia. The variegated carpet beetle and black carpet beetle are among the species commonly encountered. Carpet beetles can become a pest because their larvae damage a wide range of materials, not just carpets. The larvae are the damaging stage and may feed on wool, fur, silk, hair, fabrics, felt, underfelt and rugs, as well as other organic materials such as stored foods, dead insects and animal remains. They are often found in quiet, undisturbed areas where suitable food is available. Signs of carpet beetle activity may include damaged materials, live larvae, cast larval skins and small, sand-like droppings. Adult carpet beetles are often seen around windows as they are attracted to light and feed mainly on pollen and nectar. Carpet beetles may enter buildings from outside or be accidentally brought indoors on flowers, plants or other items. Once inside, they can find suitable areas to lay their eggs and establish an infestation.

Adult carpet beetles are small, usually measuring up to 5 mm in length, and are oval to elongate-oval in shape. The adults are generally brown with distinctive black and white markings or blemishes on the body, depending on the species. Carpet beetle larvae look quite different from the adults. They are usually red-brown in colour and have a covering of short, stiff, coarse bristles or hairs over their bodies. The larvae may be easier to find than the adults because they remain hidden in areas where they can feed. Adult carpet beetles may be seen flying or around windows, particularly when they are attracted to light. Finding adult beetles does not necessarily mean that the infestation is located in the same area, as adults can move away from the location where the larvae have been feeding. When identifying a possible carpet beetle problem, it is important to look for both the insects and evidence of larval activity, including damaged materials, cast larval skins and small, sand-like droppings.

Carpet beetles undergo a complete life cycle consisting of egg, larva, pupa and adult stages. The female lays her eggs in quiet, undisturbed areas where there is a suitable food source for the developing larvae. The eggs usually hatch within 14 to 28 days. After hatching, the larvae begin feeding and may remain in the larval stage for up to nine months. During this time, they grow and moult several times while continuing to feed on suitable materials. Once the larva has completed its development, it enters the pupal stage. The pupa is inactive and does not feed while the adult develops. This stage usually lasts around 14 to 21 days, after which the adult carpet beetle emerges. Adult carpet beetles generally live for approximately 20 to 40 days. During this time, they mate and reproduce, beginning the life cycle again. The relatively long larval period means that carpet beetle infestations can remain active for an extended period. Larvae may continue feeding and developing in concealed areas before the presence of adult beetles or damage makes the infestation noticeable.

Carpet beetle larvae are generally found in quiet, undisturbed areas where there is a suitable food source. They may remain concealed while feeding and developing, making an infestation difficult to detect until damage or other signs become noticeable. As the larvae feed, they produce small droppings that can resemble sand. Shed larval skins may also accumulate in areas where the larvae have been active. Finding droppings, cast skins or damaged materials can therefore help identify areas where carpet beetle larvae are present. Adult carpet beetles have different feeding habits from the larvae. Adults mainly feed on pollen and nectar from flowers and may commonly be seen around windows as they move towards light and attempt to reach outdoor food sources. Carpet beetles can be accidentally introduced into buildings when adults or eggs are brought indoors on cut flowers and other plant material. Once inside, adult beetles may seek out a suitable, undisturbed location where they can lay their eggs. If suitable food is available, the developing larvae can remain concealed and continue feeding in the area. Carpet beetle activity may therefore occur in areas that are rarely disturbed or cleaned, particularly where natural fibres, accumulated organic material or other suitable food sources are present.

Carpet beetles become a problem when their larvae find suitable food sources inside a building. Although they are often associated with carpets, the larvae can feed on a much wider range of materials, particularly those of animal origin. Carpet beetle larvae may damage wool, fur, hair, silk, clothing, fabrics, carpets, rugs, felt and underfelt. They may also feed on fibre-based insulating materials and other organic materials. In some situations, larvae can be found feeding on less obvious food sources such as dried insects, animal carcasses, bird or bee and wasp nests, and stored foods, including dried meats, seeds, grains and cereals. Damage can occur gradually because the larvae often remain hidden in undisturbed areas. A carpet beetle infestation may therefore continue for some time before it is noticed. Adult beetles may be seen flying or crawling, but finding adults does not always reveal where the larvae are feeding. Signs that may indicate an active infestation include damaged materials, sand-like larval droppings, bristly cast skins and live larvae. These signs can help identify areas where carpet beetle larvae are feeding or developing. Because carpet beetle larvae can use a wide variety of food sources, the source of an infestation may not always be obvious. Larvae may be concealed in areas such as wall or ceiling spaces, insulation, old nests or other locations where organic material has accumulated. Identifying these less obvious sources is important when managing an infestation.

Effective carpet beetle control begins with a thorough inspection of the premises. Because larvae can develop in concealed or undisturbed areas, simply treating the location where adult beetles or visible damage have been found may not resolve the underlying infestation. Surekill will assess the property to identify areas of carpet beetle activity and look for potential food sources. Depending on the property, this may include inspecting carpet edges, areas beneath furniture, rugs, soft furnishings, storage areas, roof cavities and other locations where natural materials or accumulated organic matter may be present. Where an infestation is identified, preparation and cleaning can form an important part of the treatment process. Removing accumulated dust, hair, pet fur and other organic material can help reduce available food sources and improve access to affected areas. Professional treatment may involve the careful application of an appropriate pest control product to areas where carpet beetle larvae are feeding or are likely to be present. Treatment methods and products will depend on the location, extent of the infestation, materials involved and conditions within the property. A comprehensive treatment approach is important because carpet beetle larvae may be located away from the areas where adult beetles are first noticed. Treating only obvious feeding areas can allow beetles to continue developing in concealed locations and contribute to reinfestation. After treatment, ongoing housekeeping and removal of potential food sources are important for reducing the likelihood of carpet beetles becoming established again.

Good housekeeping can play an important role in preventing and reducing carpet beetle problems. Regular cleaning helps remove the hair, dust, skin scales, pet fur and other organic material that can provide food for developing larvae. Vacuum carpets and rugs regularly, paying particular attention to areas that are often missed. Carpet edges alongside skirting boards, areas underneath furniture and other undisturbed locations should receive particular attention. Vacuuming soft furnishings and upholstered furniture can also help remove potential food sources and carpet beetle eggs or larvae. Pet bedding should be cleaned regularly, particularly where it may accumulate hair and other organic material. Where birds or rodents are gaining access to a building, their entry should be prevented where possible. Bird nests, animal remains and other organic material in roof or wall cavities can provide potential food sources for carpet beetle larvae. Cut flowers and plants brought indoors should be checked for insects before they are brought inside. Adult carpet beetles may be associated with flowers and can potentially be introduced into a building in this way. Clothing and other susceptible materials that are being stored should be clean and dry before storage. Where appropriate, stored clothing can be protected from pests by using clean, sealed storage containers or bags. Reducing clutter and regularly disturbing and cleaning seldom-used areas can also make it easier to detect carpet beetle activity before an infestation becomes established. Good environmental management does not replace professional treatment where an established infestation is present, but it can help remove potential food sources, reduce suitable harbourage areas and lower the risk of reinfestation.