Synchytrium endobioticum is a severe pathogen of potato causing wart disease. For this obligate fungus many pathotypes exist, which are pathogenic or nonpathogenic to different cultivars of potato. To determine to which pathotype an isolate belongs, two biological assays are used on a set of different potato cultivars: the Spieckermann and the Glynne-Lemmerzahl test. A differential set of culti…