Crown and Root Rot of Greenhouse Tomato Caused by Fusarium oxysporum f. sp. radicis-lycopersici in Korea

  • Kim, Jong-Tae (National Alpine Agriculture Experiment Station, Rural Development Administration) ;
  • Park, In-Hee (Buyeo Tomato Experiment Station) ;
  • Hahm, Young-Il (National Alpine Agriculture Experiment Station, Rural Development Administration) ;
  • Yu, Seung-Hun (Department of Agricultural Biology, Chungnam National University)
  • Published : 2001.10.01

Abstract

Forty(40) isolates of Fusarium oxysporum isolated from wilting tomato plants at Buyeo of Korea in 1997 were inoculated to four tomato cultivars (Ponderosa, Okitsu 3, Walter, and Zuiken) to examine pathogenic reactions. Isolation rates of F. oxysporum f. sp. lycopersici (FOL) races 1 and 2, and F. oxysporum f. sp. radicis-lycopersici(FORL) were 3.5%, 24.5%, and 57.5%, respectively. Mycelial growth on potato-dextrose agar at different temperature for the three pathogens was $26^{\circ}$. In the pathogenicity tests, however, the range of optimum temperature for disease development for FORL was between 15 and $20^{\circ}$, while that for races 1 and 2 of FOL were specifically pathogenic to tomato only. This suggests that host ranges of FORL and FOL differ significantly.

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