AcknowledgementsThis work was funded by the Natural Sciences and Engineering Research Council of Canada, Discovery GrantsProgram. The authors thank Brian Oates, Pacific CoastWasabi, for providing plant samples, Jesse McDonaldand Emily Betz for providing some of the diseasedwasabi photos, and the University of Guelph, LaboratoryServices Division for conducting the ITS1-ITS4 sequenceanalysis for four Phoma isolates.