| races of the celery pathogen fusarium oxysporum f. sp. apii are polyphyletic. | fusarium oxysporum species complex (fosc) isolates were obtained from celery with symptoms of fusarium yellows between 1993 and 2013 primarily in california. virulence tests and a two-gene dataset from 174 isolates indicated that virulent isolates collected before 2013 were a highly clonal population of f. oxysporum f. sp. apii race 2. in 2013, new highly virulent clonal isolates, designated race 4, were discovered in production fields in camarillo, california. long-read illumina data were used ... | 2017 | 27938244 |