The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Pink Root of Onion Caused by Pyrenochaeta terrestris (syn. Phoma terrestris)

  • Kim, Yong-Ki (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Lee, Sang-Bum (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Shim, Hong-Sik (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Lee, Chan-Jung (Onion Experimental Station, Kyungnam Agricultural Research and Extension Service) ;
  • Kim, Hee-Dae (Onion Experimental Station, Kyungnam Agricultural Research and Extension Service)
  • Published : 2003.08.01
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Abstract

Pink root of onion occurred in the fields of the Onion Experimental Station and in the main onion cultivation area in Korea in 1998 and 1999, respectively. The casual fungus of pink root was isolated only from apricot agar. Formation of pycnidia and pycnidiospores of the fungus was highest in alternating cycles of 12 hours near ultraviolet light and 12 hours in dark condition. Its morphological characteristics and pigment formation on water agar were identical with that of Pyrenochaeta terrestris. The optimum temperature for the growth of the fungus and disease development was $25-28^{\circ}C$. When onion seeds were inoculated with the spore suspension, incubated in test-tube and sown in potted soil, disease symptoms developed in onion roots 7 and 30 days after inoculation.

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References

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