Races of the potato wart causing fungus Synchytrium endobioticum (Schilb.) Perc. and some data on the inheritance of resistance to race 6

The occurrence and the nomenclature of the new physiologic races of the wart causing fungus Synchytrium endobioticum are treated. A list of varieties resistant to at least one new race has been included and also a list of differentials for the identification of the various races of the fungus. Finally details are given of testing Dutch potato varieties for resistance against race 6 while some results are mentioned of investigations concerning the inheritance of the resistance against this race.