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Mise en évidence d'une activité kairomonale des œufs de la pyrale du maïs sur les femelles deTrichogramma maidis

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Résumé

Des extraits de la surface d'œufs de Pyrale du maïs ont été testés en microenceinte et dans un olfactomètre linéaire sur des ♀♀ deTrichogramma maidis. En microenceinte, les extraits stimulent la locomotion et le comportement exploratoire des ♀♀. En olfactomètre ils stimulent à distance la remontée des tubes vers la source. Ces résultats impliquent la présence de substances à activité kairomonale sur les œufs de Pyrale du maïs. Des analyses préliminaires des extraits ont été faites par chromatographie en phase gazeuse couplée ou non à la spectrométrie de masse et démontrent la présence de nombreux hydrocarbures.

Summary

Extracts from the surface of eggs of the European corn borer were tested in small observation chambers and in a linear olfactometer for their effects on the searching behaviour of the egg-parasitoidTrichogramma maidis. In the observation chambers, the extracts elicited exploratory behaviour by female parasitoids with no previous oviposition experiences and increased the time the females spent in walking and drumming their antennae. Recording the position of 10 ♀♀ each minute for 15 min in 2 tubes of an olfactometer, indicated that upwind motion was significantly greater in the tube containing 10 μl of an egg extract than in the control tube containing just solvent. It is concluded that kairomones are present onO. nubilalis eggs and could act as searching incitants and short-range attractants. Preliminary GC and GC/MS analysis revealed the abundance of hydrocarbons in the extracts but the active chemicals were not characterized.

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Authors and Affiliations

  1. Laboratoire des Médiateurs chimiques, Domaine de Brouëssy Magny-les-Hameaux, INRA, 78114 St-Rémy-Les-chevreuse, 78000, Versailles

    M. Renou, C. Malosse & F. Ramiandrasoa

  2. Station de Zoologie, CNRA, INRA, Route de St-Cyr, 78000, Versailles

    N. Hawlitzky & A. Berthier

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  1. M. Renou
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  2. N. Hawlitzky
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  3. A. Berthier
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  4. C. Malosse
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  5. F. Ramiandrasoa
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Renou, M., Hawlitzky, N., Berthier, A. et al. Mise en évidence d'une activité kairomonale des œufs de la pyrale du maïs sur les femelles deTrichogramma maidis . Entomophaga 34, 569–580 (1989). https://doi.org/10.1007/BF02374395

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