Occurrence of Fusarium Surface Rot on Sweet Potato Caused by commune

Hyuk Woo  Kwon1   Jun Young Kim1   Sung Hwan  Min1   Min Ah Choi1   Youn-Lee  Oh2   

Abstract

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.

Acknowledgements

본 논문은 농촌진흥청 국립농업과학원 농업과학기술 연구개발사업(과제번호 : PJ008841)의 지원에 의해 수행되었으며 이에 감사드립니다.

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