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当年枯死のミズナラ6本について,地際から地上高1.5mまでの樹幹表面におけるカシノナガキクイムシの穿入孔の空間分布を解析した。2週間間隔で穿入孔の調査を行い,最初に穿入孔が発見された調査日の穿入を初期穿入とした。木あたり初期および総穿入密度は27.1および173.0個/m^2で,初期穿入割合は16.2%であった。初期穿入密度は高い部位ほど少ない傾向が,斜面上方向より斜面下方向で高くなる傾向が認められた。また,総穿入密度の解析でも,初期穿入と同様の傾向がみられた。このため,傾斜地では,穿入密度が高い地際部と斜面下方向を丁寧に処理することによって穿入防止効果が向上できるものと考えられた。We analyzed the spatial distributions of Platypus quercivorus attacks on trunk surface lower than 1.5m 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 27.1m^<-2>, and the total attack density was 173.0m^<-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

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