The pine wood nematodes carried by the Japanese pine sawyer adults emerging from a diseased pine tree without external symptoms

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  • Ohta Kazumasa
    Department of Biological Environment, Faculty of Bioresource Sciences, Akita Prefectural University
  • Hoshizaki Kazuhiko
    Department of Biological Environment, Faculty of Bioresource Sciences, Akita Prefectural University
  • Nakamura Katsunori
    Tohoku Research Center, Forestry and Forest Products Research Institute
  • Makita Akifumi
    Department of Biological Environment, Faculty of Bioresource Sciences, Akita Prefectural University
  • Kobayashi Kazumi
    Department of Biological Environment, Faculty of Bioresource Sciences, Akita Prefectural University
  • Mamiya Yasuharu

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  • 外部病徴の見られないアカマツから脱出したマツノマダラカミキリ成虫のマツノザイセンチュウ保持数
  • ガイブ ビョウチョウ ノ ミラレナイ アカマツ カラ ダッシュツシタ マツノマダラカミキリ セイチュウ ノ マツノザイセンチュウ ホジスウ

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Abstract

We found a Pinus densiflora canopy tree where the eggs had been deposited by the Japanese pine sawyer Monochamus alternatus in a coastal pine forest in Akita, October 2006. The tree exhibited no external symptoms of the pine wilt disease at that time. As discolored tree crown is an important cue to find diseased trees, we recorded the change in the crown coloration until June 2007 and then the trunk was cut into 1-m-long logs and placed in an outdoor cage to collect M. alternatus adults. The tree crown remained green and the needles were not withered (i.e. apparently healthy). No ability of oleoresin exudation on the trunk up to 4 m above the ground, indicated that the tree was weakened by the following June. Four of the 11 M. alternatus adults emerged from the caged logs in summer 2007, carried Bursaphelenchus xylophilus. An adult beetle carried 18,100 B. xylophilus, and the others < 100 nematodes individually.

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