Chemical control of grape downy mildew in North-Western Italy [Vitis vinifera L.; zoxamide; Piedmont]

摘要: English. The results of four trials against downy mildew (Plasmopara viticola) of grapevine carried out in 2003 and 2004 in Piedmont (North-Western Italy), in order to evaluate the efficacy of the new fungicide zoxamide, used alone and in mixture with different partners, in comparison to fungicides currently used, are reported. In 2004, two trials were carried out in vineyards where resistance to inhibitors of mitochondrial respiration QoI was detected. Good results were obtained by using zoxamide, applied in preventive treatments, alone and in mixture with different partners. Good results were always given by metalaxyl-M and phosetyl-Al in mixture with different fungicides and by dimethomorph in mixture with mancozeb and copper applied in preventive treatments. Also mancozeb, folpet, metiram, Cu-hydroxide and Cu-oxychloride, applied alone, offered good control of P. viticola, proving to be still effective fungicides in chemical protection of grapevine. The possibility of protecting vineyard from downy mildew by using only copper, respecting the limits imposed by the European Community, has been confirmed