Toxic substance in the leaves of fig, <i>Fieus carica</i> L., against larvae of the silkworm, <i>Bombyx mori</i>

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  • イチジク（Ｆｉｃｕｓ　ｃａｒｉｃａ　Ｌ．）生葉中のカイコに対する毒性成分
  • イチジク Ficus carica L セイ ハチュウ ノ カイコ ニ タイス

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Psoralen was isolated and identified in the leaves of fig, Ficus carica L., as a toxic substance against larvae of the silkworm, Bombyx mori. Larval growth was strongly retarded by feeding the artificial diet containing 1.0mg/g dry diet of this compound. When the fifth-instar larvae were injected with 200μg of psoralen per individual, all the test animals died in a day. In addition to the toxic effect, this chemical exhibited the feeding inhibitory effect against the silkworm at the concentration of 0.3mg/g dry diet.

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