Virulence of Ophiostomatoid Fungi Associated with the Spruce Bark Beetle Ips typographus f. japonicus in Yezo Spruce
スポンサーリンク
概要
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Yezo spruce trees (Picea jezoensis), approximately 40-year-old were inoculated with eight ophiostomatoid fungi associated with Ips typographic f. japonicus to compare relative virulence of the fungi. Among them, Ophiostoma penicillatum formed the longest necrotic lesion on inner bark around inoculation points, followed by O. aenigmaticum, Ceratocystis polonica, and O. bicolor, while C. polonica formed a larger dry zone in sapwood than the other fungi. Yezo spruce trees were also mass inoculated with C. polonica, O. penicillatum, O. piceae singly or mixed to demonstrate the ability of the fungi to kill Yezo spruce trees. The trees inoculated with C. polonica, O. penicillatum or the mixed inoculum showed discoloration of needles in the early summer of the next year and died by autumn. However, the trees inoculated with O. piceae or the control inocula did not die, except for one tree. These results indicated that C. polonica and O. penicillatum were more virulent than O. piceae and suggested that they might be at least partially responsible for the mortality of the beetle-infested Yezo spruce trees.
- 2000-05-16
著者
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Yamaoka Yuichi
Institute Of Agriculture And Forestry University Of Tsukuba
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Iguchi Kazunobu
University Forest In Hokkaido Faculty Of Agriculture The University Of Tokyo
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Takahashi Ikuo
University Forest in Hokkaido, Faculty of Agriculture, The University of Tokyo
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Takahashi Ikuo
University Forest In Hokkaido Faculty Of Agriculture The University Of Tokyo
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