O(s) TINTURA EXTRAÍDA DO RESÍDUO DA PRODUÇÃO DE VINHOS NO MANEJO DE Plasmopara vitícola EM VIDEIRA cv. ITÁLIA

Dye extracted from the waste of wine production in the management of Plasmopara viticola in vine cv. Itália

Abstract

Downy mildew, a disease caused by the etiological agent Plasmopara viticola, the ideal conditions for its establishment in the area are: high relative humidity above 70% and temperatures close to 20ºC. In this sense, seeking the development of alternative technologies to the chemical control of fungal diseases of the grapevine, the objective of the present study was to evaluate the potential of the dye extracted from the residue of the production of white wines in the management of Plasmopara vitícola in grapevine cv. Italy. The experiment was carried out from January to March 2021, in the experimental area of ??vines cv. Italy of Campus Petrolina Rural Area at IF Sertão-PE. After collection, the residues were dried, crushed and placed for cold extraction. The experimental design used was in randomized blocks composed of seven treatments: concentrations of tinctures at 1%; 5%; 10%; 25%; 50%, absolute control and positive control (fungicide) in three replicates. The sprayings were carried out weekly and the evaluations in the seed following the spraying. The collected data were submitted to analysis of variance and the means compared by the Scott-Knott test up to 5% probability. At the end of the experiment, it was observed that the best treatments with a direct impact on the reduction of the disease progress curve were: commercial fungicide and 50% tincture, demonstrating the potential of using the tincture extracted from the winemaking residue as a potential for integration into the vine downy mildew management practices in the São Francisco Valley.