Occurrence of Fusarium Surface Rot on Sweet Potato Caused by Fusarium commune
2014
Choi, H.W., National Academy of Agricultural Science, Rural Development Administration, Jeonju, Republic of Korea | Hong, S.K., National Academy of Agricultural Science, Rural Development Administration, Jeonju, Republic of Korea | Lee, Y.K., National Academy of Agricultural Science, Rural Development Administration, Jeonju, Republic of Korea | Nam, Y.J., National Academy of Agricultural Science, Rural Development Administration, Jeonju, Republic of Korea | Lee, J.G., National Academy of Agricultural Science, Rural Development Administration, Jeonju, Republic of Korea | An, C.J., Yeojusi Agricultural Technology Center, Yeoju, Republic of Korea
In June 2013, surface rot symptoms were observed on sweet potatoes (Ipomoea batatas) in Yeoju city, Korea. The lesions were circular, light to dark brown, firm, dry, and superficial. The diseased area became sunken in older tissues, and the symptoms usually did not extend deeply into the flesh. Seven isolates of Fusarium species were isolated from diseased sweet potatoes. All isolates were identified as Fusarium oxysporum based on morphological characteristics on CLA medium. To confirm the identification, molecular analysis of elongation factor 1 alpha gene was conducted. Among the isolates, however, four isolates were F. commune, and three isolates were F. oxysporum based on the DNA sequence data. Pathogenicity was tested using agar block inoculation on wounded or unwounded sweet potato pieces. Lesions were observed on wounded sweet potato pieces after 7 days inoculation in only F. commune isolates. This is the first report that F. commune causes Fusarium surface rot of sweet potato in Korea.
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