Life Cycle of the Camphor Tree Weevil, Dyscerus hylobioides (Desbrochers) (Coleoptera : Curculionidae) in Japanese Anise-tree Plantations in the Warm Temperate Lowland of Kochi Prefecture, Southwestern Japan

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概要

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• The life cycle of the camphor tree weevil, Dyscerus hylobioides (Desbrochers) was studied in japanese anise-tree, Illicium anisatum, plantations in Tosashimizu City, Kochi Prefecture, southwestern Japan. Overwintered adults appeared on host trees from April. Eggs were observed in the bark near the trunk base from May to October-November with two peaks in May-June and August-September. Numbers of pupae and adults found in logs showed a bimodal pattern with two peaks in May-July and September-November, with the first peak higher than the second. No eggs, pupae and adults were found in logs during winter and early spring. Most of the overwintering larvae were old ones. The percentage of old larvae was the lowest in June and July. Young larvae were mainly found from June to October. It is suggested that a small proportion of eggs laid early in the season (late spring) develop into adults and emerge from host trees in late autumn. However, eggs laid in the later seasons (summer-autumn) cannot develop into pupae by the end of the year of their oviposition, and as a result they overwinter during the larval stage. Pupation and adult emergence occur in the following May-July. Most newly-emerged adults did not lay eggs during the year of their emergence, and they could start to oviposit in the following year. Adults were observed on host trees until November-December. It is concluded that a two year life-cycle is common but some individuals seem to be univoltine in the warm temperate lowland of Kochi Prefecture.

• 日本昆虫学会の論文
• 1998-12-25

著者

• 若山 学

  名城大・農

• 若山 学

  奈良県森林技術センター

• Inoue T

  Evolutionary Regeneration Group Center For Developmental Biology Riken:kan Research Institute

• INOUE Takenari

  Shikoku Research Center, Forestry and Forest Products Research Institute

• TORII Shinji

  Laboratory of Silviculture, Faculty of Agriculture, Kochi University

• WAKAYAMA Manabu

  Laboratory of Silviculture, Faculty of Agriculture, Kochi University

• Torii Shinji

  Laboratory Of Silviculture Faculty Of Agriculture Kochi University:(present Address)ik Select Co.

• Inoue T

  Group For Evolutionary Regeneration Biology Center For Developmental Biology Riken Kobe

• Inoue Takenari

  Shikoku Research Ccenter Forestry And Forest Products Research Institute : (present Address)forest B

• Wakayama Manabu

  Laboratory Of Silviculture Faculty Of Agriculture Kochi University:(present Address)nara Prefectural

• Torii Shnji

  Laboratory of Silviculture, Faculty of Agriculture, Kochi University

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