Migration speed of pine wood nematodes and activities of other microbes during the development of pine-wilt disease in <i>Pinus thunbergii</i>

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  • クロマツに侵入後のマツノザイセンチュウの動きとその他の微生物相の変遷
  • クロマツに侵入後のマツザイセンチュウの動きとその他の微生物相の変遷
  • クロマツ ニ シンニュウゴ ノ マツザイセンチュウ ノ ウゴキ ト ソノタ ノ

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Abstract

Migration of PWN (pine wood nematode, Bursaphelenchus xylophilus (STEINER et BUHRER) NICKLE) from inoculated branches into the main stem of Pinus thunbergii PARL. was very fast, ca. 150cm/day. This means the effect of active PWN movement must be considered in discussing early physiological change of pine cells. Xylem water-blockage caused by cavitation started one week after nematode inoculation. In contrast, fungal species detected from pine tissue were the same with those in healthy trees during 4 weeks after nematode infection, Pestalotiopsis spp., Nigrospora spp., Cladosporium spp., and Phomopsis spp. There existed no specific fungus at the start of water blockage. Blue stain fungus Ceratocystis sp. and bacteria were detected throughout the trunks 5 weeks after nematode inoculation. Before that period, however, blockage of xylem waterconduction and cambial necrosis had already progressed in the wide areas of trunks. From these results, we concluded PWN itself causes pine-wilt and any fungi or bacteria in pine tissue did not contribute to symptom development of pine-wilt disease after the PWN inoculation.

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