Newly Unidentified Butt-Rot Basidiomycetous Fungus of Japanese Larch and Method for Baiting the Fungus from the Soil

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  • 新カラマツ根株心腐病菌とその土壌中からの捕捉
  • 新カラマツ根株心腐病菌とその土壌中からの捕捉〔英文〕
  • シン カラマツ ネカブ シングサレビョウキン ト ソノ ドジョウチュウ カラ

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Abstract

A total of 149 Japanese larch trees (Larix leptolepis (SIEB. and ZUCC.) GORD.) with butt rot from the Yatsugatake University Forest, University of Tsukuba, a seed-collection forest in Kawakami-mura, and a National Forest in Nagano Prefec-ture were used for the isolation of butt-rot fungi. The fungi isolated included Phaeolus schweinitzii (FR.) PAT. (17%), Tyromyces balsameus (PECK) MURR. (7%), Sparassis crispa (WULF. ex FR.) FR. (7%), and a newly unidentified butt-rot fungus (27%) which caused heavy damage to larches in these areas. The fungi were not isolated from 41% of the trees tested. This new fungus was isolated consistently from parts of brown cubical rot, and sometimes thick, black mycelial strands of the fungus (up to 1mm in width) could be observed in the intermediate and final stages of decay. Colonies on malt extract agar which were cottony and white at first, often became slightly yellowish-brown. Hyphae were up to 16μm wide with multiple clamp connections. Mycelial strands consisting of three to more than ten hyphae were formed. No conidia nor chlamydospores were formed. This fungus was baited from the soil with larch stakes driven into the soil. The black mycelial strands became attached to the surface of the stakes within six months of the placement of the stakes. The investigation of the stakes with the mycelial strands showed that the fungus partially inhabits the soil.

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