Utah State University Extension
Clover mites, Bryobia praetiosa Koch, are not insects but are more closely related to chiggers, ticks, and spiders. They belong to the spider mite family Tetranychidae. These mites are found throughout the world on trees, shrubs, flowers, grasses, and agricultural crops.
Karren, Dr. Jay B. and Roe, Alan H., "Clover Mites" (2000). All Current Publications. Paper 878.