Effect of Trichoderma sp. SKT-1 on suppression of six different seedborne diseases of rice.

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  • KUMAKURA K.
    Kumiai Chemical Industry Co, Ltd., Research and Development Department
  • WATANABE S.
    Kumiai Chemical Industry Co, Ltd., Life Science Research Institute
  • TOYOSHIMA J.
    Kumiai Chemical Industry Co, Ltd., Research and Development Department
  • MAKINO T.
    Shizuoka Agricultural Experiment Station
  • ICHIKAWA T.
    Shizuoka Prefecture Seibu Agriculture and Forestry Office
  • IYOZUMI H.
    Shizuoka Agricultural Experiment Station
  • NAGAYAMA K.
    Kumiai Chemical Industry Co, Ltd., Life Science Research Institute

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Other Title
  • Ｔｒｉｃｈｏｄｅｒｍａ　ｓｐ．ＳＫＴ‐１株による６種のイネ種子伝染性病害の発病抑制効果
  • Trichoderma sp. SKT-1株による6種のイネ種子伝染性病害の発病抑制効果
  • Trichoderma sp SKT 1カブ ニ ヨル 6シュ ノ イネ シュシ デンセンセイ ビョウガイ ノ ハツビョウ ヨクセイ コウカ

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Strain SKT-1 of Trichoderma sp., when rice seeds were soaked in a suspension of its conidia at 4×104-1×106 conidia/ml, gave high control of “Bakanae” (foolish seedlimg) disease, that was nearly equivalent to that of seed disinfection with ipconazol-copper flowable. At 2×105-1×106, it also gave high control of bacterial seedling blight, bacterial grain rot and bacterial brown stripe, nearly equivalent to those of seed disinfection with oxolinic acid wettable powder. At 1×107, it also gave control of blast and brown spot in the stage of seedling, nearly equivalent to that of ipconazol-copper flowable. Typical pathogenic symptons, such as damping-off, poor emergence and growth retardation, were not observed when rice seeds and seedling bed soil were treated with SKT-1. SKT-1 conidia and with those washed by centrifugation gave clear control against “Bakanae” disease and bacterial seedling blight was clearly seen, but neither SKT-1 conidia killed by autoclaving nor the supernatant solution from the centrifugation controlled disease. SKT-1 strain gave high control of “Bakanae” disease and bacterial seedling blight in treatments during soaking and germination. In post-seeding treatments of conidia at low concentrations, however, disease control of “Bakanae” disease decreased and bacterial seedling blight was not controlled by any SKT-1 concentration tested. Tests performed on the loss of disease control in combination with benomyl revealed that SKT-1 had lost its inhibitory effects against “Bakanae” disease by one day after seeding and against bacterial seedling blight by the time of seeding. In subsequent combined treatments, however, SKT-1 controlled both diseases.

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