Concrete mites are small, reddish-brown arachnids often observed on concrete surfaces around homes and buildings. They are a common sight, particularly during certain times of the year, prompting questions about their nature and impact.
Identifying Concrete Mites
Concrete mites are minuscule, typically measuring less than one millimeter in length. Their bodies are often reddish-brown or dark red, and they possess eight legs, characteristic of arachnids. These tiny creatures are frequently encountered on hard, outdoor surfaces such as sidewalks, driveways, building foundations, and brick walls.
While commonly referred to as concrete mites, they are not a distinct species unique to concrete. They are often clover mites, scientifically known as Bryobia praetiosa, which are a type of plant-feeding mite. Other similar mite species that feed on vegetation may also be observed in these locations. Their small size and color make them noticeable against lighter-colored concrete or stone.
Impact and Concerns
Concrete mites generally do not pose a threat to structures, human health, or pets. They do not cause damage to concrete or other building materials, nor do they bite, sting, or transmit diseases.
The main concern arises when they are present in large numbers, particularly if they migrate indoors. If crushed, their bodies can leave a reddish or brownish stain on surfaces like walls, carpets, or upholstery. This staining is primarily a nuisance, making them a nuisance pest rather than a destructive or health-threatening one.
Where They Are Found and Why
Concrete mites prefer sunny, warm environments, explaining their frequent presence on sun-drenched concrete and brick surfaces. They are typically found near dense vegetation, such as lawns, ground cover, and shrubs adjacent to buildings, as their diet consists primarily of plant material.
These mites feed on algae, fungi, mold, and decaying organic matter that often grows on concrete surfaces and in nearby vegetation. They do not consume the concrete itself. Environmental factors like moisture accumulation near foundations and suitable temperatures also favor their populations, providing an ideal habitat and food source.
Managing Their Presence
Managing concrete mites often involves altering their environment around structures. Maintaining a vegetation-free strip, approximately 18 to 24 inches wide, around building foundations can reduce their access and food sources. Sealing cracks and openings in concrete and around foundation walls helps prevent mites from entering. Reducing excessive moisture near foundations by improving drainage or adjusting irrigation can also make the area less hospitable.
Regular cleaning of concrete surfaces, such as power washing, can remove algae, mold, and other organic matter that serves as a food source. For mites that enter homes, sealing potential entry points like gaps around windows and doors is effective. Non-toxic removal methods, such as vacuuming or wiping with a cloth dampened with soapy water, can effectively address mites found indoors. These methods prevent staining and safely remove the mites without chemical treatments.