Journal of General Plant Pathology

, Volume 79, Issue 1, pp 86–88 | Cite as

First report of black scurf on carrot caused by binucleate Rhizoctonia AG-U

  • Tomoo Misawa
  • Takeshi Toda
Disease Note


Black scurf on carrot roots was found in Hokkaido, Japan, in 2010. An isolate of a binucleate Rhizoctonia was obtained from sclerotia on the root surface. This isolate was identified as anastomosis group (AG)-U based on cultural characteristics, hyphal fusions and the sequence of ribosomal DNA-internal transcribed spacer region. The AG-U isolate caused black scurf symptoms on carrot roots in an inoculation test. The reference isolate of Rhizoctonia solani AG-2-2 IV, which causes carrot root rot, a disease with symptoms that differ from the black scurf symptom. This is the first report of carrot black scurf caused by binucleate Rhizoctonia AG-U.


AG-U Binucleate Rhizoctonia Black scurf Carrot 



We thank Dr. S. Kuninaga (Health Sciences University of Hokkaido, Japan) for providing the reference isolates and N. Takada (Hokkaido Prefectural Oshima Agricultural Extension Center, Japan) for sampling support.


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Copyright information

© The Phytopathological Society of Japan and Springer Japan 2012

Authors and Affiliations

  1. 1.Donan Agricultural Experiment StationHokkaido Research OrganizationHokutoJapan
  2. 2.Faculty of Bioresource ScienceAkita Prefectural UniversityAkitaJapan

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