Induction of Precocious Metamorphosis by Dietary Administration of 1-Citronellyl-5-phenylimidazole in the 4th Instar Larvae of the Silkworm, <i>Bombyx mori</i> L.

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  • ASANO Shoji
    Department of Technical Research, Earth Chemical Co., Ltd.
  • KUWANO Eiichi
    Department of Agricultural Chemistry, Kyushu University
  • ETO Morifusa
    Department of Agricultural Chemistry, Kyushu University

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Other Title
  • 1-Citmnellyl-5-phenylimidazoleの摂食による4齢蚕における早熟変態の誘導
  • 1-Citronellyl-5-phenylimidazoleの摂食による4齢蚕における早熟変態の誘導〔英文〕
  • 1 Citronellyl 5 phenylimidazole ノ セッショク

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Abstract

The unequivocal induction of precocious metamorphosis was demonstrated by dietary administration of 1-citronellyl-5-phenylimidazole (KK-22) in the 4th instar silkworms, Bombyx mori, and was observed in response to doses: 100% activity at 25-100ppm, 62.5% at 12.5ppm, and 6.3% at 6.25ppm. Precocious pupation induced by KK-22 always occurred with prolongation of the 4th larval stage. The weights of the precocious cocoon and cocoon shell were about 1/2 and 1/3 of those in normal silkworms, respectively. The pupal molt was not influenced by KK-22. In contrast to precocene I and II, KK-22 induced distinct precocious metamorphosis in the silkworm without any antifeedant and lethal effects and inhibition of larval growth.

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