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Five strains of Armillaria mellea were collected from the forest of Chonbuk province and isolated from the tissue of fruit bodies. Nutritional and environmental characteristics of mycelial cultivation and rhizomorph production of Armillaria mellea isolated were determined in sawdust media, woody inocula and soils. The sawdust media of Styphnolobium japonicum, Culhamia simplex, Populus monilifera and Populus davidiana were proper for mycelial growth. The ranges of optimum pH, temperature and moisture content for mycelial growth were in the range of 4.5∼5.0, ∼25℃ and 65∼70%, respectively. Among the various additives and inorganic salts added, 10% rice bran and 3% CaCO₃ were effective to mycelial growth. The woody inocula of Styphnolobium japonicum, Culhamia simplex, Quercus acutissima and Quercus veriabilis were proper for rhizomorph production. The ranges of optimum pH, moisture content and temperature for rhizomorph production were in the range of 4.5∼4.9, 45∼55% (w/w) and 20∼24℃, respectively. Distribution of rhizomorphs in soil was varied with depth, but the main concentration occurred in the range of 7.5∼12.5 ㎝. They were rarely found below 25.0㎝.
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