Host-finding behavior and insecticidal activity of steinernematid entomopathogenic nematodes against the ambrosia beetle, <i>Platypus quercivorus </i>(Coleoptera : Platypodidae).

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  • <b><i>Steinernema</i></b>属昆虫病原性線虫のカシノナガキクイムシに対する殺虫活性と宿主探索行動
  • Steinernema属昆虫病原性線虫のカシノナガキクイムシに対する殺虫活性と宿主探索行動
  • Steinernemaゾク コンチュウ ビョウゲンセイ センチュウ ノ カシノナガキクイムシ ニ タイスル サッチュウ カッセイ ト ヤドヌシ タンサク コウドウ
  • Host-finding behavior and insecticidal activity of steinernematid entomopathogenic nematodes against the ambrosia beetle, Platypus quercivorus (Coleoptera : Platypodidae).

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Abstract

To use steinernematid entomopathogenic nematodes as a biological control agent against the ambrosia beetle, Platypus quercivorus, the vector of Japanese oak wilt, their host-finding behavior, insecticidal activity and penetration capability were examined using a tiny glass tube system (simulated gallery system; SGS). In the SGS, Steinernema carpocapsae more vigorously moved to P. quercivorus larvae than to Galleria mellonella larvae, a well-known suitable host. Also S. carpocapsae showed high insecticidal activity against the larvae and adults of P. quercivorus by the inoculation assay, while insecticidal activity of S. glaseri against the larvae of P. quercivorus was low. In the case of S. carpocapsae, the number of nematodes invading the larvae or adults of P. quercivorus increased with an increase in the number of nematodes applied, and thereby insecticidal activity also increased. This suggests high potentialities of S. carpocapsae in its infection and insecticidal activity against both larval and adult stages of P. quercivorus, while S. glaseri showed no positive infectivity against the larvae of P. quercivorus. However, S. carpocapsae was little attracted to the extracts (ethyl ether/ethanol) of P. quercivorus larvae and adults, although strongly attracted to those of G. mellonella larvae. On the contrary, the movement of S. glaseri was enhanced by the extracts of P. quercivorus larvae and adults, but not by those of G. mellonella larvae.

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