"Worldwide, dust mites are the main causative agent of one of the worst ailments of twentieth-century man".**
Dermatophagoides pteronyssinus and D. farinae are the most common species of house dust mites in North Carolina. These tiny mites are most abundant in warm, humid areas. Contrary to popular belief, house dust mites do not bite or sting. They feed on shed human skin scales that collect in the dust on furniture, particularly mattresses, and on carpeting below beds.
House dust mites are importance medically because they produce allergens in their secretions and excrement. Inhalation of dust containing mite feces and cast skins is a common cause of asthma in young children.
Sanitation is the key to reducing house dust mite populations. Frequent and thorough vacuuming removes mites and the organic debris on which they feed. You should target critical areas, such as mattresses, bed frames, rugs and carpets (especially under beds), and on and under overstuffed furniture.
You can reduce conditions favorable to mite development through routine maintenance of air conditioner filters and by lowering humidity indoors. Encasing mattresses and pillows in plastic covers and frequent changing of bed linen also help prevent mite populations from building up. Only one insecticide (Acarasan) is registered for use against house dust mites. Its use should be considered only for severe infestations.
Prepared by:
Charles S. Apperson and Michael Waldvogel
Entomology Extension Specialists
North Carolina Cooperative Extension Service
