Abstract
Abstract In the Italian viticultural regions, downy mildew, caused by Plasmopara viticola, is considered one of the most devastating diseases, particularly where moderate temperatures and frequent rainfall occur during the grapevine vegetative season. This chapter deals with the QoI resistance in this pathogen in Italy and presents the results of the surveys carried out to evaluate the sensitivity of P. viticola to QoIs in different Italian regions (Emilia Romagna, Piemonte, Trentino-Alto Adige, Friuli Venezia Giulia, Lombardia and Veneto, and Puglia). The characteristics of resistant strains and the evolution of QoI resistance are described. Several methods for the detection of QoI resistance in P. viticola are given, and the mechanism and management of QoI resistance are discussed.
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