Harvest mites - also known as red bugs, scrub-itch mites, berry bugs or, in their larval stage, as chiggers, jiggers, or chigoe - are all part of the genus Trombicula. Harvest mites are found throughout the world although they tend to be more prevalent in the hot and humid parts. In the more temperate regions, they are found only in the summer, when grass, weeds and other vegetation are heaviest. In the United States, they are found mostly in the southeast, the south, and the Midwest. They are not present, or barely found, in far northern areas, in high mountains and in deserts.