Early Attack Distribution of the Oak Borer Platypus quercivorus (Coleoptera: Platypodidae) on the Trunk Surfaces of Newly Infested Trees.

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  • Esaki Kojiro
    Ishikawa-ken Forest Experiment Station
  • Kato Kenryu
    Graduate School of Natural Science and Technology, Kanazawa University NIKON INSTECH Co., Ltd.
  • Kamata Naoto
    Graduate School of Natural Science and Technology, Kanazawa University University Forest in Chichibu, Graduate school of Agricultural and Life Science, The University of Tokyo

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  • 樹幹表面におけるカシノナガキクイムシの初期穿入分布
  • ジュカン ヒョウメン ニ オケル カシノナガキクイムシ ノ ショキ センニュウ ブンプ

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Abstract

We analyzed the spatial distributions of Platypus quercivorus attacks on trunk surface lower than 1.5 m above the ground level of six Quercus crispula trees, which were newly infested and killed in the season. The density of the entry holes (attack density) on the census occasion when insect attacks were first observed on respective trees, early attacks, was 27.1 m−2, and the total attack density was 173.0 m−2, on average. The percentage of the early attacks was 16.2%. The early attack density was correlated negatively with the heights above the ground level, and tended to be higher on the downhill-facing half than on the uphill-facing half of trunk surface of investigated trees. A similar tendency was also found in the total attack density. These results suggests that the attacks of Platypus quercivorus can be controlled by intensive treatment on tree trunks on down-hill facing surface near root collar, on which attack density will be higher than any other parts of trunks.

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