<i>Rhizoctonia solani</i>および<i>Pythiun splendens</i>に対する土壌の抑止作用の検索

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  • KO Wen-hsiung
    Department of Plant Pathology, University of Hawaii, Beaumont Agricultural Research Center
  • HO Wang-ching
    Department of Plant Pathology, University of Hawaii, Beaumont Agricultural Research Center

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タイトル別名
  • Screening soils for suppressiveness to Rhizoctonia solani and Pythium splendens.
  • Rhizoctonia solaniおよびPythium splendensに対する土壌の抑止作用の検索〔英文〕
  • Rhizoctonia solani オヨビ Pythium splenden

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説明

Growth of mycelia and germination of sporangia amended with root extract on soil surface were used to detect soils suppressive to Rhizoctonia solani and Pythium splendens, respectively. In tests with 30 soil samples collected from various locations in Hawaii, 5 inhibited growth of R. solani more than 50% and 8 inhibited sporangial germination of P. splendens more than 50% as compared with conducive soil. Three of the soils were suppressive to both R. solani and P. splendens. Steaming the soil for 10-15min at 97-98C eliminated suppressiveness as evidenced by no reduction of either mycelial growth of R. solani or sporangial germination of P. splendens. Steam treatment reduced populations of fungi, actinomycetes, and bacteria in suppressive soils to approximately 0.04%, 1% and 5%, respectively, of the original numbers. Propylene oxide treatment and autoclaving increased inhibition on some soils. Similar effects were not found on steam-treated soils. The results indicate that suppressive soils may exist in small islands in a field and that the degree of suppressivenss variees from location to location.

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