カラマツ根株心腐病菌の侵入口 Invasion Sites of Butt Rot Fungi in Japanese Larch

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日林誌84:9〜15,2002カラマツ根株心腐病菌の生態を明らかにするために,36〜41年生の3林分で腐朽伐根調査を行った。調査林分では,カイメンタケとハナビラタケが病原菌として多く分離された。病原菌の子実体は梅雨期から初秋まで発生し,胞子の飛散は比較的長期間にわたると推察された。腐朽伐根の掘取り調査を行ったところ,腐朽伐根には約10本の主根がみられ,そのうち1〜2本に侵入口となった傷がみられた。侵入口の種類は,5タイプに分けられ,開口・大型の傷,根切れ・根腐れタイプが多かった。侵入口の形成部位は根株と主根が大半を占め,いずれの場合も深さ30cm以内の浅い位置であった。侵入口の年輪調査によって,病原菌の侵入時期は,樹齢7年〜31年生と推察された。侵入口となった伐根の傷は,石レキあるいは風が原因と推察された。

J. Jpn. For. Soc. 84: 9〜15, 2002 In order to clarify the ecology of fungi causing butt rot, damage to rot-infected stumps was investigated in three 36- to 41-year-old Japanese larch (Larix kaempferi) stands. Two kind of causal fungi, Phaeolus schweinitzii and Sparassis crispa were frequently isolated from rot-infected stumps in the stands examined. Periodic stump observations found that the fruiting bodies of P. schiweinitzii and S. crisfra formed from late June to early September, showing that the basidiospores of the causal fungi are dispersed over a relatively long period of time. In the excavated root systems of rot-infected stumps, one or two of the up to ten primary roots commonly sprouting from the stumps had wounds identified as obvious sites for the ingress of butt rot fungi. Wounds identified as invasion sites were classified into 5 types by morphological characters. The most frequent types of wound were open wounds or large scars, and rotted or cut roots. Most wounds were formed at the base of the stumps and in primary roots less than 30 cm below ground level. Observations of the annual rings at the wounds suggested that the fungal invasion had occurred in 7- to 31-year-old larch trees. Inspection of the stumps indicated that wound formation resulting in invasion sites was closely associated with environmental conditions. Significant causal factors were stones in the soil and strong winds.

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  • 日本林學會誌

    日本林學會誌 84(1), 9-15, 2002-02-16

    一般社団法人日本森林学会

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各種コード

  • NII論文ID(NAID)
    110002830695
  • NII書誌ID(NCID)
    AN00198561
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0021485X
  • NDL 記事登録ID
    6103496
  • NDL 雑誌分類
    ZR21(科学技術--農林水産--林産)
  • NDL 請求記号
    Z18-340
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  IR  J-STAGE 
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