New highly aggressive pathotype 354 of Plasmopara halstedii in German sunflower fields

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

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