Byrobia praetiosa is a pest related to spiders and found throughout the United States. They feed, and reproduce on clover, many grasses and other plants. They are each a mite smaller than the size of a pinhead.
Clover mites are reddish-brown and have long front legs.
Often infestations are so plentiful that infested surfaces get a reddish cast to the surface. If crushed, the mites leave a reddish stain. Mites lay eggs during the summer and fall. Young hatch from the eggs and feed on surrounding vegitation. In early autumn they migrate into homes and other protected areas by entering through cracks or openings in the foundation of the home or around windows and doors.