オリーブアナアキゾウムシ成虫の存在場所および行動の日周的・季節的変化

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タイトル別名
  • Diurnal and seasonal changes of location and behavior in adult olive weevil, Dyscerus perforatus (Roelofs) (Coleoptera: Curculionidae)
  • オリーブアナアキゾウムシ セイチュウ ノ ソンザイ バショ オヨビ コウドウ

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Location and behavior of the adult olive weevil, Dyscerus perforatus (ROELOFS), were surveyed both under laboratory and field conditions, mainly in a field cage, from April 1982 to May 1983. Adult behavior was classified into the following seven states, inactivity, pause, walking, feeding, mounting, copulation and oviposition. Based on the surveys conducted in the field cage, the active period of the adults ranged approximately from April to October. The adults were active on the olive tree mainly at night. Although most of the adults were inactive in the daytime, some of them were observed to be engaged in repeated mounting or copulation activities on the ground covered with dry gramineous grasses (covered ground) surrounding the base of the olive tree and some females were also found ovipositing near the base of the tree. The adults located on the olive tree or on the bare ground were more abundant in the daytime during cloudy days than in the daytime during fine days. The overwintering adults in the field cage were generally inactive, and many of them were located on the covered ground both in the daytime and at night. Their activity, however, did not completely cease, and some of them moved on the ground and climbed the olive tree.

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