Takuma Nakamura: Damage report of Japanese oak wilt in Shiiba Research Forest, Kyushu University

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  • 九州大学農学部附属演習林宮崎演習林におけるブナ科樹木萎凋病の被害報告
  • キュウシュウ ダイガク ノウガクブ フゾク エンシュウリン ミヤザキ エンシュウリン ニ オケル ブナカ ジュモクイチョウビョウ ノ ヒガイ ホウコク

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We investigated the first year damage caused by Japanese oak wilt which is a vector-borne disease transmitted by Platypus quercivorus in the Shiiba Research Forest, Faculty of Agriculture, Kyushu University. We found that 18 % of the Fagaceous trees in the study sites, excluding those of the genus Fagus, were damaged by Platypus quercivorus. The proportion of damaged trees per species was the highest for Lithocarpus edulis, but the mortality rate of damaged trees was the highest for Quercus crispula, raising concerns about significant changes in the forest ecosystem in the future. Differences in damage rates of individual tree species and tree DBH classes suggested that Platypus quercivorus may be selecting tree species and tree sizes. There is a possibility that Platypus quercivorus are migrating northward from the south side of the forest. It is necessary to observe the progress of the forest on the north side, which has not been damaged yet, and to study damage control methods and to restore vegetation after the damage has been controlled.

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