Plant Protect. Sci., 2018, 54(2):83-86 | DOI: 10.17221/99/2017-PPS

New highly aggressive pathotype 354 of Plasmopara halstedii in German sunflower fieldsOriginal Paper

Otmar Spring*, Reinhard Zipper
Institute of Botany, University of Hohenheim, Stuttgart, Germany

Downy mildew of sunflower is a recurrent threat for crop production and a permanent challenge for resistance breeding. Since 2016, a new pathotype of the oomycete Plasmopara halstedii has been found in fields of cutting sunflower in Southern Germany. Infection assays based on sunflower differential lines identified the pathogen as pathotype 354 which has not yet been described anywhere else. The new pathotype readily infected the host lines Ha-304, RHA-265, PM13, 803-1, and Ha-335, whereas RHA-274, PM17, HAR-4, and QHP1 remained uninfected. It is the first isolate of Plasmopara halstedii to overcome the Pl-6 resistance of sunflower in Germany.

Keywords: Helianthus annuus; oomycetes; sunflower downy mildew; virulence pathotype

Published: June 30, 2018  Show citation

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Spring O, Zipper R. New highly aggressive pathotype 354 of Plasmopara halstedii in German sunflower fields. Plant Protect. Sci. 2018;54(2):83-86. doi: 10.17221/99/2017-PPS.
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