Predator-prey relationship in the vertical distribution of mites on grapevines

Phytophagous mites can cause economic losses in many crops, including grapevines. The changes their population levels may be associated with the predator-prey relationship. Knowledge of distribution plants is important for planning sampling strategies and facilitating control decisions. aims this study were to (i) evaluate abundances Tetranychus urticae (Tetranychidae) Neoseiulus californicus (Phytoseiidae), correlations between them environmental factors; (ii) determine on top, middle, or base strata evaluated grapevines (Vitis vinifera, Chardonnay cultivar) and, additionally, report first occurrence damage caused by T. grapevine leaves state Rio Grande do Sul, Southern Brazil. Sixteen samplings conducted, divided 2018 2019 seasons. In each sampling, three from plant (top, base) collected 20 plants, totaling 60 per sampling. relationship association variables multivariate correlation, whereas number leaf was compared using a generalized linear mixed model R software. It possible observe symptoms attacks Brazil, characterized presence yellow spots general yellowing vineyard. Our findings indicate that N. individuals are strongly other regardless variables, such occurs mainly lower (middle leaves) Thus, taking into account majorities specific these vineyards, we suggest should priority targets management mites.