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- W1977944063 abstract "We tested the deterrent effects of non-host plant secondary compounds on Manduca sexta Johan. larvae, in choice tests. Treatment chemicals were applied, at approximately natural concentrations to either glass fiber or tobacco leaf disks. Of 30 compounds tested on glass fiber disks, with artificial diet reared larvae, 6 were deterrent. When the 6 deterrent chemicals were tested on tobacco leaf disks only one was still deterrent. No deterrent effects were observed when tobacco reared larvae were tested with chemicals applied to tobacco leaf disks. The results suggest that maintenance of restricted host range in M. sexta larvae relies not on avoidance of non-hosts due to deterrence but on attraction and stimulation to feed on hosts. Résumé La relative insensibilité de chenilles de Manduca sexta aux composés secondaires des plantes nonhôtes Nous avons examiné au moyen des expériences de choix, les effets dissuasifs des composés secondaires de plantes non-hôtes des chenilles de M. sexta Johan. Des disques de fibres de verre ou des rondelles de feuilles de tabac ont été traités chimiquement, aux concentrations à peu près naturelles. Sur les 30 substances examinées sur les disques de fibres de verre, 6 ont été répulsives pour des chenilles élevées sur aliment artificiel. Quand l'examen est effectué avec des rondelles de feuilles de tabac, seul un produit est encore répulsif. Aucun effet répulsif n'est observé quand des chenilles élevées sur tabac sont mises en présence de substances associées à des rondelles de feuille de tabac. Ces résultats suggèrent que le maintien d'un spectre d'hôtes limité chez les chenilles de M. sexta ne repose pas sur l'évitement des plantes non-hôtes par suite de leurs substantes dissuasives, mais sur l'attraction et la stimulation provoquées par les hôtes." @default.
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- W1977944063 date "1990-02-01" @default.
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- W1977944063 title "The relative insensitivity of Manduca sexta larvae to non-host plant secondary compounds" @default.
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- W1977944063 doi "https://doi.org/10.1111/j.1570-7458.1990.tb01320.x" @default.
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