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

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Strain SKT-1 of Trichoderma sp., when rice seeds were soaked in a suspension of its conidia at 4 × 10^4-1 × 10^6 conidia/ml, gave high control of "Bakanae" (foolish seedlimg) disease, that was nearly equivalent to that of seed disinfection with ipconazolcopper flowable. At 2 × 10^5-1 × 10^6, 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 × 10^7, it also gave control of blastand 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.
日本植物病理学会の論文
2003-11-25

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

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