<i>Rhizoctonia solani </i>AG-2-1 によるブロッコリー苗立枯病

  • 三澤 知央
    北海道立総合研究機構 農業研究本部 道南農業試験場
  • 山崎 和也
    桧山農業改良普及センター檜山北部支所
  • 高田 一直
    北海道立総合研究機構 農業研究本部 道南農業試験場

書誌事項

タイトル別名
  • Damping-off of Broccoli Caused by <i>Rhizoctonia solani </i>AG-2-1
  • Rhizoctonia solani AG-2-1によるブロッコリー苗立枯病
  • Rhizoctonia solani AG-2-1 ニ ヨル ブロッコリー ナエ タチガレビョウ

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<p>Damping-off of broccoli was observed in Hokkaido, Japan in late-May 2012. An isolate obtained from diseased tissues was identified as Rhizoctonia solani anastomosis group(AG)-2-1 on the basis of hyphal anastomosis and the result of PCR analysis with specific primers. The cultural appearance of the isolate from broccoli was light brown, whereas that of typical AG-2-1 culture type Ⅱ was brown. Also the mycelial growth of the isolate was slower than that of typical culture type Ⅱ. The AG-2-1 isolate and six reference isolates, belonging to culture type Ⅱ obtained from various Brassica plants, caused basal stem rot in broccoli seedlings in inoculation tests, indicating that pathogenicity to broccoli seedlings is the universal characteristic of AG-2-1 isolates as well as of the light-brown and slow-growing isolate. As no damping-off of broccoli caused by R. solani AG-2-1 has not been reported in Japan, we hereby propose including it as one of the pathogens of the disease.</p>

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