Abstract
Viticulture is an activity of economic importance in the state of Rio Grande do Sul, especially in Serra Gaucha, which is the major grape-producing region. However, an increase in cultivated areas has been observed in other municipalities in the state. The aim of this study is to characterize mite diversity, community behavior on different varieties, recognizing which predatory species have potential to control phytophagous mites associated with Europan varieties in the Taquari Valley, Rio Grande do Sul state. The study was conducted in vineyards located in the municipalities of Marques de Souza: BRS Vitoria and cv Italia m, Imigrante: cv Italia i, Dois Lajeados: cv (c and f), Tannar and Chardonnay, and Putinga: Champanhe and Moscato. Samplings were carried out monthly in the period ranging from March 2017 to March 2018, during which twenty plants were randomly collected from each variety. Three leaves were clipped from each plant, one from the apical third, one from the median third, and one from the basal third, totaling 60 leaves per area. A total of 10,533 specimens were collected, belonging to 12 families, 38 genera, and 53 species, along with those belonging to the suborder Oribatida. The Italia c variety had the highest abundance (2,012), followed by Moscato (1,788) and BRS Vitoria (1,593). Phytoseiidae had the highest diversity among the mite families observed, with 20 species followed by Tetranychidae (8). The most abundant species were Polyphagotarsonemus latus (Banks) (3,420) and Euseius concordis (Chant) (565), present throughout the study period. Chardonnay variety had the highest similarity (72.55%) among mite fauna compositions and the highest dissimilarity occurred between BRS Vitoria and Champanhe varieties (95.48%). Environment sevaluated in Dois Lajeados and Putinga were the most homogeneous concerning mite fauna diversity and abundance.