著者

Haruo Kinuura Masahide Kobayashi

出版者

JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY

雑誌

Applied Entomology and Zoology (ISSN:00036862)

巻号頁・発行日

vol.41, no.1, pp.123-128, 2006 (Released:2006-04-10)

参考文献数

18

被引用文献数

51 59

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Adult Platypus quercivorus beetles were artificially inoculated into Japanese oak trees (Quercus crispula). Two inoculation methods were used: uniform inoculation through pipette tips, and random inoculation by release into netting. Four of the five trees that were inoculated uniformly died, as did all five trees that were inoculated at random. Seven of the nine dead trees showed the same wilting symptoms seen in the current mass mortality of oak trees. Raffaelea quercivora, which has been confirmed to be the pathogenic fungus that causes wilt disease and is usually isolated from the mycangia of P. quercivorus, was isolated from all of the inoculated dying trees. Trees that died faster showed a higher density of beetle galleries that succeeded in producing offspring. We found positive relationships between the density of beetle galleries that succeeded in producing offspring and the rate of discoloration in the sapwood and the isolation rate of R. quercivora. Therefore, we clearly demonstrated that P. quercivorus is a vector of R. quercivora, and that the mass mortality of Japanese oak trees is caused by mass attacks of P. quercivorus.

著者

小林 正英 Masahide KOBAYASHI 尚美学園大学総合政策学部 Shobi University

出版者

尚美学園大学総合政策学部総合政策学会

雑誌

尚美学園大学総合政策論集 = Shobi Journal Of Policy Studies,Shobi University (ISSN:13497049)

巻号頁・発行日

vol.25, pp.19-32, 2017-12-25

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EU-NATO関係は「死に体」と化していると言われる。そうであるとするならば、いつ、どのようにしてそうなったのだろうか。冷戦後、EUが安全保障政策分野に乗り出したことで、NATOとの競合の種は蒔かれていた。しかしながら、ベルリン・プラス合意策定によって競合は回避され、分業と協調の欧州・大西洋安全保障ガバナンスの枠組みが構築されるかに見えた。本論は、ソマリア沖海賊対策作戦に焦点を当てながら2008-2012年のEU-NATO関係の転機について分析するものである。