Lethal Effect of a Benzimidazole Fungicide, Benomyl, on the Oviposited Eggs of a Parasitoid Wasp, <i>Cotesia</i> <i>glomerata</i>（Hymenoptera: Braconidae）

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  • Arakawa Toru
    Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO)

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  • ベンズイミダゾール系殺菌剤ベノミルが寄生蜂アオムシコマユバチ（ハチ目：コマユバチ科）の卵に及ぼす致死作用
  • ベンズイミダゾールケイ サッキンザイ ベノミル ガ キセイバチ アオムシコマユバチ(ハチモク : コマユバチカ)ノ タマゴ ニ オヨボス チシ サヨウ

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<p>Benomyl, a benzimidazole-based fungicide, was inoculated orally at 0.025% with an artificial diet into white cabbage butterfly larvae, Pieris rapae crucivora（Boisduval）（Lepidoptera: Pieridae）, which had been parasitized by a parasitoid wasp, Cotesia glomerata（L.）（Hymenoptera: Braconidae）. The inoculation resulted in the death of the parasitoid eggs. The dead eggs were encapsulated by host hemocytes in the host hemocoel. While benomyl was harmless to the host P. rapae larvae as inoculated larvae developed to the adult stage, it had harmful effects on the parasitoids following inoculation at a concentration of 0.0005% or higher in an artificial diet. Benomyl was toxic not only when inoculated with an artificial diet but also with cruciferous leaves.</p>

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