Updated and annotated review of Tetranychidae occurring in mainland Portugal, the Azores, and Madeira Archipelagos Author Naves, Pedro Instituto Nacional de Investigação Agrária e Veterinária, I. P. (INIAV), Av. da República, Quinta do Marquês, 2780 - 157 Oeiras, Portugal. & GREEN-IT Bioresources for Sustainability, ITQB NOVA, Portugal. Author Nóbrega, Filomena Instituto Nacional de Investigação Agrária e Veterinária, I. P. (INIAV), Av. da República, Quinta do Marquês, 2780 - 157 Oeiras, Portugal. Author Auger, Philippe CBGP, INRAE, CIRAD, IRD, Montpellier SupAgro, Univ Montpellier, Montpellier, France. text Acarologia 2021 2021-04-30 61 2 380 393 http://dx.doi.org/10.24349/acarologia/20214437 journal article 10.24349/acarologia/20214437 2107-7207 5393899 Tetranychus urticae Koch, 1835 The two-spotted spider mite, T. urticae , particularly the red form formerly known as T. cinnabarinus ( Auger et al. 2013 ) and T. telarius ( Smith and Baker, 1968 ) is locally widespread and quite common ( Carmona 1960 ; 1973a ; Carmona and Dias 1980 ; Ferreira 1980 ; Ferreira and Carmona 1995 ). The mite is present all over the mainland ( Carmona and Dias 1980 ), and also found on Madeira ( Carmona 1973a ; Carmona and Dias 1996 ) and on three Azorean Islands (FAI, TER and SMG) ( Costa-Comelles et al. 1993 ; Borges et al. 2010 ). The two-spotted spider mite is associated with a wide range of hosts, including wild and ornamental plants and agricultural crops, being quite common on grapes and fruit trees, where it causes damage ( Carmona 1988 ; Carmona and Ferreira 1989 ; Sobreiro 1993 ; Carmona and Dias 1996; Brites et al. 2019 ). Other common hosts include bean ( Ferreira 1980 ; Ferreira and Carmona 1994 ), corn ( Pereira 2004 ), tomato ( Ferreira and Carmona 1995 ) and raspberries ( Rubus idaeus ), particularly in greenhouses ( Ferreira 2016b ). The number of annual generations varies from six to twelve, according to the region and local climatic conditions ( Rodrigues 2012 ). According to Neves (2012) , populations usually increase after application of wide-spectrum pesticides, which probably disrupt natural control by predatory phytoseiid mites ( Rodrigues 2012 ). It is the most common species in the INIAV acarological collection, associated with multiple plant hosts but mainly with tomato, strawberry, and vineyards.