This research was carried out in twenty counties of the following regions in the state of Rio Grande do Sul: Plain, Central Depression, Plateau and Coast Plain to find out the diversity of mite predators in these places. Forty-six vegetable species were sampled, thirty species of miles of the families Anystidae, Ascidae, Cheyletidae, Cunaxidae, Phyloseiidae and Stigmaeidae were mel. The Phytoseiidae were the mite that presented the greatest diversity, being present in the majority of the sample plants. Most of the Phytoseiidae that were met belong to five species of the Euseius Wainstein, 1962 genus, the second genus of this family was Iphiseiodes DeLeon, 1966, with just one species. The Stigmaeidae come up as second family in number but fewer than Phytoseiidae. In this family, the most common mite belong to the Agistemus Sumers, 1960 genus. The biggest of the mites species (13 species), was met in Morus spp. (Moraceae) and Tabebuia spp. (Bignoniaceae); Phaseolus vulgaris (Papilionaceae); only one species of the mite was met in Campomanesia spp. (Myrtaceae), Phaseolus vulgaris (Papilionaceae) and Rosa spp. (Rosaceae). In Alamanda spp.(Apocinaceae), Ficus spp. (Moraceae), Jacaranda mimosifolia (Bignoniaceae) and Solanum spp. (Solanaceae) were met mites predators. A dichotomic key is presented to separate the families, genus and species of the mites.
Acari; Phytoseiidae; mites; diversity of mite; Rio Grande do Sul