Population Dynamics of the Chestnut Gall-wasp <i>Dryocosmus kuriphilus</i> YASUMATSU (Hymenoptera: Cynipidae)

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  • クリタマバチの個体群動態に関する研究
  • クリタマバチ ノ コタイグン ドウタイ ニ カンスル ケンキュウ エイブン 1
  • I. Description of the Survey Stations and the Life Histories of the Gall-wasp and Its Parasites
  • 第1報 調査区の記載およびクリタマバチとその寄生バチの生活史

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Abstract

Prior to the publication of serial reports on population dymanics of the chestnut gall-wasp, Dryocosmus kuriphilus, the life histories of the gall-wasp and its parasites, methods of the study, and the sketch of the permanent survey stations were reported in this paper.<br>The gall-wasp is a univoltine parthenogenetic insect, of which only female is known. The female lays her eggs into buds of the chestnut tree and the larvae grow in their ball-like galls in the next spring. Causes of mortality influential to the population dynamics are considered to be larval parasitisms and death of adults before the completion of the oviposition. Most parasites have alternative host. Permanent stations are settled at Narashino, Chiba Prefecture, Ôyama, Kanagawa Prefecture, and Tama Zoological Park, Tokyo, of these the first place being recently invaded by the gall-wasp, but the other two being invaded before several years. Routine procedures of sampling shoots and galls were described.

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