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1-Octen-3-ol. A potent olfactory stimulant and attractant for tsetse isolated from cattle odours

  • D. R. Hall (a1), P. S. Beevor (a1), A. Cork (a1), Brenda F. Nesbitt (a1) and G. A. Vale (a2)...
Abstract

Recording of electroantennographic (EAG) responses from tsetse, Glossina pallidipes and G. morsitans morsitans (Diptera: Glossinidae) has been used to detect olfactory stimulants in volatiles from cattle. The most potent stimulant in cattle odours collected on Porapak resin has been identifiedas 1-octen-3-ol by gas chromatographic retention data and mass spectrometry. The rate of production of 1-octen-3-ol by a normal ox was estimated to be 0.043 mghr−1, and the natural material was shown to be predominantly the (R)-(−)enantiomer. No 1-octen-3-ol was collected under the conditions used in the absence of an ox. EAG dose-response curves to 1-octen-3-ol showed it to be about 106 times more potent than acetone, a known attractant for tsetse, with the maximum response of about 1 mV occurring to approx. 1 ng at source. 1-octen-3-ol caused increased upwind flight by tsetse in a wind tunnel bioassay, and in the field it was attractive to tsetse by itself and also increased the attractiveness of both ox odour and of mixtures ofcarbon dioxide and acetone.

Les réponses électroantennographique (EAG) des mouches tsé-tsé, Glossina pallidipes et G. morsitans morsitans (Diptera: Glossinidae), ont été notées afin de découvrir les stimulants olfactifs parmi les composés volatils émanant du bétail. Le stimulant le plus puissant dans l'odeur de bétail, recueillié sur la résine Porapak, a été identifié comme 1-octen-3-ol en utilisant des données de rétention chromatographique en phase gazeuse et spectrométrie de mass. On a estimé le taux de production de 1-octen-3-ol par un boeuf normal à 0,043 mg hr−1 et la matiére naturelle s'est révélée comme composée en majeure partie de l'enantiomère (R)-(−). Dans les conditions utilisées, on n'a recueillié de 1-octen-3-olqu'enpresence d'un boeuf. Les courbes de dosage-réponse EAG pour 1-octen-3-ol l'a révélé à peu près 106 fois plus puissant que l'acétone, un attractant connu pour les mouches tsé-tsé, la réponse maximum d'environ 1 mV étant enregistrée pour environ 1 ng à la source. 1-octen-3-ol a occasionne un accroissement de vol des mouches tsé-tsé contre le vent dans un tunnel aérodynamique. Sur le terrain 1-octen-3-ol s'est révélé attractif tout seul et a augmenté la puissance attractive de l'odeur de boeuf et aussi dés mélanges de bioxyde de carbone et d'acétone.

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International Journal of Tropical Insect Science
  • ISSN: 1742-7584
  • EISSN: 1742-7592
  • URL: /core/journals/international-journal-of-tropical-insect-science
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