サンゴジュハムシ成虫のサンゴジュ樹上における個体数の季節変動

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タイトル別名
  • サンゴジュハムシ セイチュウ ノ サンゴジュ ジュジョウ ニ オケル コタイス
  • Seasonal Population Dynamics of the Adult Viburnum Leaf Beetle, Pyrrhalta humeralis (CHEN) (Coleoptera: Chrysomelidae), on the Host Tree, Viburnum awabuki K. KOCH

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1.サンゴジュハムシ成虫のサンゴジュ樹上における個体群動態並びに摂食消長に関する調査を1983年に千葉県松戸市で行ない, 本種の死亡要因を検討した.2.本種の成虫は6月下旬をピークに羽化し, 羽化後1〜2週間の間に高い死亡率を示した.主な死亡要因は夏眠に入る前の夏の高温と考えられた.3.マーキング法による樹上個体数の推定結果より, ハムシ成虫は羽化後旺盛な摂食活動ののち, 樹上よりの移出・移入を繰り返しつつ夏を過すものと思われた.そして, 夏眠の終了する8月下旬にサンゴジュ樹上で最大個体数となった.4.夏眠期間は摂食量が著しく低下するが, 夏眠に入る前には充分な摂食が必要と思われた.

During the course of 1983, seasonal dynamics of the on-tree population of the adult Viburnum leaf beetle, Pyrrhalta humeralis (CHEN), were monitored and estimated using Jolly's capture-recapture method at Matsudo, Chiba-Pref.. Associated seasonal fluctuations of their feeding intensity on the Viburnum leaf were also observed under the quasi-natural conditions in a large outdoor cage. With these basic information, factors responsible for population dynamics of adult beetles were investigated. Results of the observation indicated that beetles emerged during the two months of June and July, having its peak in late June. The greatest mortality for adult beetles came within a couple of weeks after their emergence, and only those which could consume a considerable amount of food during this period seemed to advance to the subsequent summer diapause. During this less-active period, survival of adult beetles was fully assured with little mortality, although their emigration and immigration around the tree were observed to be common even at this stage. As a result, on-tree population of the beetles had a peak in late August after the diapause termination at the observation site.

source:The technical bulletin of Faculty of Horticulture, Chiba University

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