オリーブアナアキゾウムシ成虫の越冬場所

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  • Hibernation Sites of Adult Olive Weevils, Dyscerus perforatus (ROELOFS) (Coleoptera: Curculionidae).
  • オリーブアナアキゾウムシ セイチュウ ノ エットウ バショ

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Hibernation sites of adult olive weevils, Dyscerus perforatus (ROELOFS) were surveyed from January to March in four olive orchards where pest controls had not been used for more than 5 years. The olive tree trunks and branches, and the ground within 1m from each trunk base were surveyed. The ground at three of the four orchards was completely covered with weeds and fallen leaves and many emergence holes were found on all the olive trees surveyed in these orchards. The number of hibernating adults found in the survey area of living trees ranged from 16 to 117 per tree, whereas only two hibernating adults were found on and around a dead tree. Most hibernating adults were found on the ground surface within 50cm of the trunk base. The ground at the other orchard was sparsely covered with weeds and fallen leaves. In this orchard, only a small number of emergence holes were found on each olive tree and two hibernating adults were found at most in the survey area.

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