Effect of Two Insecticides on Density Suppression of the Oriental Tea Tortrix, <i>Homona magnanima</i> Diakonoff (Lepidoptera: Tortricidae), by an Egg Parasitoid, <i>Trichogramma dendrolimi</i> Matsumura (Hymenoptera: Trichogrammatidae)

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  • Ishijima Chikara
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization
  • Toyoshima Shingo
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization
  • Sato Yasushi
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization

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  • キイロタマゴバチによるチャハマキの密度抑制効果に及ぼす2種殺虫剤の影響
  • キイロタマゴバチ ニ ヨル チャハマキ ノ ミツド ヨクセイ コウカ ニ オヨボス 2シュ サッチュウザイ ノ エイキョウ

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Abstract

An experiment was conducted in screened houses to examine the effect of insecticides on density suppression of the oriental tea tortrix, Homona magnanima Diakonoff, by an egg parasitoid, Trichogramma dendrolimi Matsumura. Ethiprole-thiacloprid, with low insecticidal activity against T. dendrolimi, was sprayed in plot A, and tolfenpyrad, with high insecticidal activity against T. dendrolimi, was sprayed in plot B. Ethiprole-thiacloprid was significantly less harmful to parasitism of H. magnanima eggs by T. dendrolimi than tolfenpyrad. The density of H. magnanima larvae tended to be affected by differences in insecticides, but no significant difference was observed between Plot A and B. These results suggested that ethiprole-thiacloprid was less harmful to density suppression of H. magnanima by T. dendrolimi than tolfenpyrad.

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