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Since almost a century, sunflower cultivation is endangered by Plasmopara halstedii (Farlow) Berlese & de Toni, a biotrophic oomycete causing downy mildew symptoms. The pathogen has conquered four of the five continents, and through high genetic plasticity recurrently avoided being reliably controlled by the introduction of resistant host cultivars in sunflower production. This paper attempts to retrace the historic routes of sunflower downy mildew spreading from its North American origindoi:10.17221/32/2019-pps fatcat:z52nmlklabaivnstq2h4gdtwcq