Abstract
The viticulture in the State of São Paulo represents 14% of the Brazilian production. One of the major problems in São Paulo viticulture is the frequent occurrence of downy mildew (Plasmopara viticola). The average number of fungicide spraying in São Paulo vineyards is in average 103 and 59 in European and American grapevine cultivares, respectively. Most of these sprays aim to control do…