sp. nov. (Oomycota, Peronosporales), a Downy Mildew Species Specialized to (Balsaminaceae).

Over the past 15 years, downy mildew became the most destructive foliar disease in cultivated species (Balsaminaceae) worldwide. A previous study had revealed that the causal agent was not (Oomycota, Peronosporales) but on , and on . This hints to a relatively high degree of specialization of on Balsaminaceae. Therefore, it was the aim of the present study to perform multigene phylogenetic analysis and detailed morphological investigation for several Korean downy mildew samples parasitic to cultivated , and , but also to a northeast Asian wild plant, . It was revealed that harbors a new species, which is introduced and described here as .