Verticillium Wilt of Potato Caused by Verticillium albo-atrum in Daegwallyong Area in Korea

Kim, Jong Tae; Ryu, Kyoung Yul; Kim, Jeom Soon; Hahm, Young Il; Yu, Seung Hun

doi:2003.19.3.184

Plant Pathol J > Volume 19(3); 2003 > Article

The Plant Pathology Journal 2003;19(3):184-187.
DOI: https://doi.org/10.5423/PPJ.2003.19.3.184 Published online June 30, 2003.

Verticillium Wilt of Potato Caused by Verticillium albo-atrum in Daegwallyong Area in Korea

Jong Tae Kim, Kyoung Yul Ryu, Jeom Soon Kim, Young Il Hahm, Seung Hun Yu

Abstract

Verticillium wilt was first observed in 2001 on potatoes (Solanum tuberosum) cv. Superior at Daegwallyong area, one of the major seed potato producing areas in Korea. The wilted potato plants showed typical symptoms including gradual yellowing and interveinal necrosis. There was discoloration in the vascular tissues of the infected stems which turned light brown. Fungal isolates from discolored vascular tissues were whitish to creamy with folding on potato dextrose agar medium, where they used to produce resting dark mycelia but no microsclerotia. Conidiophores were septate with side branches, swelled at the base, and arranged in a whorl. Conidia were 2.5-11.2×2.0-4.5 μm in size and were borne in small clusters at the tips of phialides. Optimal temperature range for mycelial growth was 25-30˚C. Based on these cultural and morphological characteristics, the fungus was identified as Verticillium albo-atrum Reink & Berth. Pathogenicity tests by root dipping method revealed that the fungus caused the same symptoms as observed in naturally infected potato plants. This is the first report of Verticillium wilt on potato caused by Verticillium albo-atrum in Korea.

Key Words: potato, soil-borne pathogen, Verticillium albo-atrum, Verticillium wilt