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Journal of General Plant Pathology

, Volume 66, Issue 1, pp 12–17 | Cite as

Occurrence of Fusarium oxysporum f. sp. melonis Race 1 in Japan

  • Fumio NAMIKI
  • Kanji SHIMIZU
  • Kyoko SATOH
  • Tetsuo HIRABAYASHI
  • Kazufumi NISHI
  • Tsuruo KAYAMURA
  • Takashi TSUGE

In 1994, Fusarium wilt of melon cultivars which are resistant to races 0 and 2 of Fusarium oxysporum f. sp. melonis was observed in southern area of the Lake Biwa region, Shiga prefecture. In commercial fields, mature plants of cv. Amus which were grafted onto cv. Enken Daigi 2, and of cv. FR Amus showed yellowing, wilting and finally death before harvesting of fruits. Diseased plants had vascular and root discolorations, and their stem sections yielded typical colonies of F. oxysporum. When the Shiga strains were tested for their pathogenicity to 12 species of cucurbits, they caused wilts only on melon. Using race differential cultivars of melon, the Shiga strains were classified as race 1 of F. oxysporum f. sp. melonis, which has not been reported in Japan. To further characterize their pathogenicity, the strains were used to inoculate 46 additional cultivars of melon, oriental melon and oriental pickling melon. All the race 1 strains were pathogenic to the cultivars tested, and their host range was apparently different from those of strains belonging to other races (races 0, 2 and 1,2y). DNA fingerprinting with a repetitive DNA sequence, FOLR3, differentiated race 1 strains from strains of races 0 and 2, but not from race 1,2y strains.

Keywords: Fusarium oxysporum f. sp. melonis, Fusarium wilt, melon, race 1. 

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Copyright information

© The Phytopathological Society of Japan 2000

Authors and Affiliations

  • Fumio NAMIKI
    • 1
  • Kanji SHIMIZU
    • 2
  • Kyoko SATOH
    • 3
  • Tetsuo HIRABAYASHI
    • 3
  • Kazufumi NISHI
    • 1
  • Tsuruo KAYAMURA
    • 4
  • Takashi TSUGE
    • 5
  1. 1.Kyushu National Agricultural Experiment Station, Nishigoshi, Kumamoto 861-1192, JapanJP
  2. 2.Shiga Prefectural Agricultural Experiment Station, Azuchi, Shiga 521-1301, JapanJP
  3. 3.Nihon Horticultural Production Institute, Matsudo 270-2221, JapanJP
  4. 4.Kumamoto Prefectural Agricultural Research Center, Koshi, Kumamoto 861-1113, JapanJP
  5. 5.Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, JapanJP

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