Abstract
Failure to sprout due to seed-tuber rot is a serious problem for autumn potato seedling cultivation in Nagasaki Prefecture, Japan. In this study, five strains were isolated from rotten seed tubers sampled in 2015; when tubers were inoculated with these strains, the tubers developed rot and failed to sprout. We identified these strains as Fusarium acuminatum, Fusarium commune, and the known agent of potato dry rot, Fusarium oxysporum based on morphological and DNA sequencing analyses. F. commune and F. acuminatum were identified as causal agents of potato dry for the first time in the world and in Japan, respectively.
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