Efficacy of new commercial formulations to control downy mildew and dissipation of their active fungicides in wine after good agricultural practices



BACKGROUND: The efficacy of common fungicides to control downy mildew (Plasmopara viticola) in vines decreases when the same commercial formulations are applied over several years. For this reason, new commercial formulations (containing new fungicides) have to offer to grape-growers to increase the efficacy of antifungal treatments. The efficacy of five new commercial formulations (Cabrio Top, Equation Pro, Fantic M, Mikal Premium and Fobeci) to control downy mildew in an experimental vineyard producing white grapes (Vitis vinifera cv. Godello) was studied. All these products have in common a new fungicide (pyraclostrobin, famoxadone, benalaxyl-M, iprovalicarb and benalaxyl, respectively) in their chemical formulation.

RESULTS: Two commercial formulations, Cabrio Top and Fobeci, gave the highest efficacy to control this fungal disease. Once treated white grapes were harvested, the fate of these fungicides from vine to wine was studied. The white winemaking process allowed the dissipation of fungicide residues in high percentages (∼95%), except for iprovalicarb (45%). Concentrations in final filtered white wines were close to or lower than 0.01 mg L−1 for all detected fungicides except iprovalicarb and fludioxonil. The following dissipation rate was found: famoxadone > cyprodinil > pyraclostrobin > benalaxyl > folpet > fludioxonil > benalaxyl-M > penconazole > iprovalicarb.

CONCLUSION: From the data obtained in the vinification process, estimated maximum residue levels for white wines were proposed for future EU legislation to control the presence of pesticides in white wines. Thereby one helps to assure also the wine quality and protection of consumer health. Copyright © 2009 Society of Chemical Industry