Annual Changes in Damage Caused by Japanese Oak Wilt in a <i>Lithocarpus edulis</i> Forest in Kamogawa, Chiba Prefecture and a <i>Quercus serrata</i> Forest in Seto, Aichi Prefecture

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  • Kusumoto Dai
    The University of Tokyo Chiba Forest, Graduate School of Agricultural and Life Sciences, the University of Tokyo
  • Hisamoto Yoko
    The University of Tokyo Chiba Forest, Graduate School of Agricultural and Life Sciences, the University of Tokyo The University of Tokyo Chichibu Forest, Graduate School of Agricultural and Life Sciences, the University of Tokyo
  • Murakawa Isao
    The University of Tokyo Chiba Forest, Graduate School of Agricultural and Life Sciences, the University of Tokyo
  • Sawada Haruo
    Ecohydrology Research Institute, Graduate School of Agricultural and Life Sciences, the University of Tokyo

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  • 千葉県鴨川市のマテバシイ林と愛知県瀬戸市のコナラ林におけるナラ枯れ被害の年次推移
  • チバケン カモガワシ ノ マテバシイリン ト アイチケン セトシ ノ コナラリン ニ オケル ナラ カレ ヒガイ ノ ネンジ スイイ

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Abstract

<p>We investigated the annual changes in damage caused by Japanese oak wilt in a Lithocarpus edulis forest in Kamogawa, Chiba Prefecture, and in a Quercus serrata forest in Seto, Aichi Prefecture. The number of trees infested by Platypus quercivorus increased over the first 3-4 years in both study sites, but rapidly declined when the percentage of the infested trees exceeded 90％ in L. edulis forest and 80％ in the Q. serrata forest. At the end of the damage period, most trees with diameters less than 10 cm at breast height were not infested, whereas 70-80％ of the trees with diameters of 10-20 cm at breast height and 90-100％ of the trees with diameters of 20 cm and above at breast height were infested. The annual changes in symptoms of the individual trees showed that more than 95％ of Q. serrata trees that survived beetle infestation the previous year were still alive the following year. In contrast, 20-30％ of L. edulis trees that survived beetle infestation the previous year deteriorated or died the following year, indicating that the process leading to mortality differs between the two study sites. This study suggests that forest damage caused by Japanese oak wilt ended when almost all the trees, except for small diameter trees around 10 cm in diameter, were infested in both L. edulis and Q. serrata forests.</p>

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