オオコクヌスト成虫放虫によるマツノマダラカミキリ捕食実験 Effect of released adults of Trogossita japonica (Coleoptera: Trogossitidae) on the Japanese pine sawyer, Monochamus alternatus (Coleoptera: Cerambycidae) in pine bolts

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オオコクメスト成虫放虫によるマツノマダラカミキリへの捕食効果を,アカマツ丸太を入れた網室に双方の成虫を放すことで調べた。1996年の試験では7月の2週間,双方の成虫を同時に放した。放虫後回収したカミキリはほとんど生存していて,死亡したわずかも外傷はなかったことから,野外での成虫によるカミキリ成虫の捕食はないと判断できた。また,期間中放飼虫は飢えていて,ほとんど産卵できなかったと思われた。そこで,1997年の試験では,餌としてマツノマダラカミキリ終齢幼虫を丸太に針で刺した。卵巣の発達状況から産卵は行なわれたと考えられたが,割材調査ではカミキリ幼虫数に対照区と差がなく,放した成虫の子世代による捕食効果はみられなかった。キクイムシ類の加害が全ての丸太に多くみられた野外網室からは3頭のオオコクヌスト幼虫が得られたが,カミキリがいるだけでキクイムシ類がいなかった室内網室からは1頭しか得られなかった。このことは,野外丸太のような多様な生物が住む丸太ではオオコクヌストの生育が良く,捕食効果が上がるであろうことを暗示する。

Predation of Trogossita japonica Reitter (Coleoptera: Trogossitidae) on the Japanese pine sawyer, Monochamus alternatus Hope (Coleoptera: Cerambycidae), the vector of pine wilt disease, was investigated by release of adults of both species into cages containing pine bolts. In an experiment held in 1996, both species were released simultaneously for two weeks in July. After the release period, most cerambycid beetles released with the predators were still alive and any dead beetles had no external wounds. Thus, it was clear that the predator was not able to predate on the adult of the cerambycid beetle in the field, and the predators were thought to have starved during the release period and so laid few eggs. In a similar experiment held in 1997, final instar larvae of M. alternatus were pinned on bolts as diet for the predators. Ovarial development showed that the female predators laid eggs. Bolts were then investigated further by cutting them open, and the number of cerambycid beetles in bolts did not differ from that of the control in which predators were not released. These results show that there was no observed effect of predation of larval offspring of released predators on larval offspring of released cerambycid beetles. Three larvae of the predator, however, were collected from outdoor cages where all bolts were heavily attacked by bark beetles but only one from indoor cages where only M. alternatus was present and where no bark beetles had attacked bolts. These results indicate that bolts containing various other invertebates may support the development of the predator and increase its predatory effect.

収録刊行物

  • 森林応用研究

    森林応用研究 8(0), 169-172, 1999

    応用森林学会

各種コード

  • NII論文ID(NAID)
    110009497574
  • 本文言語コード
    JPN
  • ISSN
    1342-9493
  • データ提供元
    NII-ELS  J-STAGE 
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