Survey of pesticide residues in vineyard soils from the Denomination of Origin Ribeiro
Vineyards from mild temperature, high humidity locations receive often treatments with fungicides to prevent damages produced by fungi responsible for mildium, oidium and botrytis infections. In addition, insecticides are also applied to vineyards to fight again pests, which affect directly, or indirectly (as vectors of different diseases), their productivity. A fraction of the above compounds reaches the soil of vineyards, either during application, or when released from the canopy of vines due to rain-wash-off. Thereafter, depending on soil conditions (pH, organic matter) and environmental variables (regimen of rain, slope of vineyards), they might persist in this compartment, be degraded and/or transferred to water masses, modifying the biodiversity of soils and/or affecting the quality of water reservoirs.
In this presentation, the presence of residues for a suite of 50 pesticides in soils of vineyards from the D.O. Ribeiro, managed under different agronomic practices, was explored. Data on occurrence, temporal and spatial evolution are provided considering two sampling campaigns carried out at the end of summer, and the end of the next winter, taking soils at two different depths (0-5 and 5-20 cm). For some chiral compounds, i.e. myclobutanil, the potential existence of enantioselective soil degradation processes was assessed through their enantiomeric fractions in this matrix. Pesticide residues ranged from non-detected (organic vineyards) to several hundreds of ng g-1 in case of myclobutanil, fluopicolid and dimethomorph.
Acknowledgements: Funds received from AGACAL (project ref. AC2021E-02), and Xunta de Galicia (project ED431C2021/06) are acknowledged.
Issue: ICGWS 2023
1 Estación de Viticultura e Enoloxía de Galicia (EVEGA-AGACAL), Ponte San Clodio s/n, 32428, Leiro-Ourense
2 Department of Analytical Chemistry, Nutrition and Food Sciences, IAQBUS – Institute of Research on Chemical and Biological Analysis, Universidade de Santiago de Compostela, R/Constantino Candeira SN, 15782 Santiago de Compostela, Spain
3 Área de Edafoloxía e Química Agrícola, Departamento de Bioloxía Vegetal e Ciencia do Solo, Facultade de Ciencias. Universidade de Vigo. 32004. Spain