Invasion of <i>Bursaphelenchus xylophilus</i> into Dead <i>Pinus densiflora</i> Tree through Oviposition Wounds Made by <i>Monochamus alternatus</i>

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  • マツノマダラカミキリの産卵痕を経由したアカマツ枯死木へのマツノザイセンチュウの侵入
  • マツノマダラカミキリ ノ サンランコン オ ケイユ シタ アカマツ コシ ボク エ ノ マツノザイセンチュウ ノ シンニュウ

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<p>The pinewood nematode, Bursaphelenchus xylophilus, is thought to invade dead pine trees via oviposition wounds made by Monochamus alternatus, but the phenomenon has not been confirmed in the field. In the present study, we investigated to determine whether the nematode invasion into Pinus densiflora trees killed by some factor other than pine wilt disease through the oviposition wounds occurs in the field. Not only many oviposition wounds but also many entrance holes and pupal chambers made by the beetle were found in the dead pine trees. The nematode positive reaction was detected in wood under an oviposition wound, without either an oviposition wound or larval frass, and in pupal chamber walls using the Bursaphelenchus xylophilus detection kit. This is the first report of the nematode invasion into dead pine trees via oviposition wounds by M. alternatus in the field.</p>

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