Pest Control – Beetles

Dermestes Beetles (Flour Beetle, Grain Weevil, Carpet Beetle, Biscuit Beetle)


All these species are often found in the home as the adult beetles fly well and can enter the home through open windows and doors, or via lofts and under floor areas. They will sometimes inhabit birds nests, it is also therefore advisable to check for nesting birds.

Once inside the home the adult beetles lay up to 200 eggs on a material suitable as food for larvae. They can feed on a wide range of materials including wool, fur, hair, feathers, scraps of human or animal food and the dried remains of animals or plants.

Usually it is the adult beetles that are first noticed, but these cause very little damage at the larval stage how ever they often cause damage and contamination of the material they have infested.


These beetles are not known to transmit any diseases to human beings and therefore pose no threat to health. However, control of these pests is advisable to prevent the economic losses that can result from the damage and contamination of household materials and food.


Although these beetles may be encountered in the home, their presence in large numbers is often the result of poor standards of hygiene. Before carrying out any insecticidal control, the areas where the beetles have been found should be thoroughly cleaned to remove any food debris and infested material.

All areas should be treated with a residual, crawling insect insecticidal spray, approved for this specific purpose.  Concentrating the spray around the skirting board area and in a criss-cross pattern on the floor will usually suffice. Remove food from your kitchen cupboards (throwing away contaminated items), and spray them if necessary. They must be dry to the touch before any food is returned and this should be in containers so there is no direct contact between food and treated cupboard/surfaces.

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