Density of Pythium zingiberum Oospores in Relation to Infection of Chenopodium quinoa Seedlings

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著者

    • IKEDA Akihiro
    • Laboratory of Plant Pathology, College of Agriculture:(Present address)Aichi-ken Agricultural Research Center

抄録

The infectivity tests were repeated and the average results obtained indicated that more than 1×10^4 oospores per gram oven dry soil (OPG) caused damping-off of 80% of Chenopodium quinoa seedlings. About 20% damping-off occurred with 1×10^3 OPG. With 1×10^2 OPG the average was 6%, and penetrating mycelium and oospores were easily recognized. Neither penetration nor disease incidence was found with 1×10 OPG. Thus, the minimum number of oospores capable of inducing disease was estimated to be 10-1×10^3/g oven dry soil. The fact that P.zingiberum needs much more oospores than P.butleri to induce disease may be connected with lower germinability of oospores of the former.

The infectivity tests were repeated and the average results obtained indicated that more than 1×10^4 oospores per gram oven dry soil (OPG) caused damping-off of 80% of Chenopodium quinoa seedlings. About 20% damping-off occurred with 1×10^3 OPG. With 1×10^2 OPG the average was 6%, and penetrating mycelium and oospores were easily recognized. Neither penetration nor disease incidence was found with 1×10 OPG. Thus, the minimum number of oospores capable of inducing disease was estimated to be 10-1×10^3/g oven dry soil. The fact that P.zingiberum needs much more oospores than P.butleri to induce disease may be connected with lower germinability of oospores of the former.

収録刊行物

  • Bulletin of the University of Osaka Prefecture. Ser. B, Agriculture and biology   [巻号一覧]

    Bulletin of the University of Osaka Prefecture. Ser. B, Agriculture and biology 37, 13-18, 1985-03-31  [この号の目次]

    大阪府立大学

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各種コード

  • NII論文ID(NAID)
    110004788942
  • NII書誌ID(NCID)
    AA00106812
  • 本文言語コード
    ENG
  • 資料種別
    Departmental Bulletin Paper
  • ISSN
    03663353
  • データ提供元
    CJP引用  NII-ELS  IR 
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