[Copper fungicides at low dose rate against grapevine downy mildew [Vitis vinifera L.; Piedmont]]

application rates cobre control de enfermedades controllo delle malattie contrôle de maladies copper cuivre damage danno daños disease control dose d'application dosi di applicazione dosis de aplicación dégât environmental factors experimentación en campo expérimentation au champ facteur du milieu factores ambientales feuille field experimentation fitotossicità fitotoxicidad foglie fongicide fungicidas fungicides fungicidi hojas infección infection infezione leaves phytotoxicity phytotoxicité piamonte piedmont piemonte piémont plasmopara viticola rame sintomi sperimentazione in campo symptome symptoms síntomas vitis vinifera vitis vinífera