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¹ Agricultural Academy, Institute of Viticulture and Enology, Department of Vine Selection, Enology and Chemistry, Pleven, Bulgaria
² Agricultural Academy, Institute of Viticulture and Enology, Department of Vine Technologies and Plant Protection, Pleven, Bulgaria DOI : 10.52001/vis.2022.9.33.43 Viewed : 8236 - Downloaded : 3170 The influence of the herbicides Pledge 50 VP, Lumax 538 SK and Guild, applied in a vineyard of Cabernet Sauvignon variety on the chemical composition of the grapes and the obtained wines was investigated in this study. The study was carried out in the period 2017-2019 with monitoring of the weather factors over the years. The treatment with herbicides was performed on an annual basis, during the last week of May, as they were introduced into the intra-row stripe once, with a backpack sprayer. For comparison, a non-herbicide treated control variant was used. The treated variants did not exceed the control for the sugar content of the grapes. The sugar ratio decreased in the order Control>V3 Guild>V2 Lumax 358 SK>V1 Pledge 50 VP. The most favorable in terms of sugar accumulation in grapes was 2019. The alcohol content of the wines was in correlation with the sugars in the grapes. Regarding the sugar-free extract in 2017 and 2018, with the exception of the variant treated with Pledge 50 VP, the rest exceeded the control, while in 2019 it had the highest rate. The total phenolic compounds in wines varied from 2.62±0.84 to 2.73±0.93 g L^-1. Their change increased in the order Control Keywords : Herbicides Grapes Wine Chemical composition