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Devenir de l’œuf et comportement de la larve dePhanerotoma flavitestacea [Hym.: Braconidae] lorsque la femelle pond dans des œufs d’Anagasta kuehniella [Lep.: Pyralidae] ayant atteint des stades de développement variés

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Résumé

Quand des œufs d’âges variés (1 h à 5 j) du lépidoptèreAnagasta kuehniella Zell. sont offerts aux femelles parasites dePhanerotoma flavitestacea Fisch., l’endroit où l’œuf du parasite est déposé, dépend du stade de développement de l’œuf hôte au moment de l’oviposition.

Lorsque l’œuf hôte est âgé de 1 h à 3 j, la ponte a lieu dans le vitellus. Par contre, si l’œuf du parasite est déposé dans un œuf âgé de 4 jours ou plus, il est directement pondu dans l’embryon hôte.

Selon ces résultats, il semble que la pénétration de l’œuf du parasite ou de la larve est due uniquement à un mouvement passif causé par la migration du vitellus dans le tube digestif moyen de l’embryon hôte.

Ces différents points et l’effet de la piqûre de l’ovipositeur sur l’embryon hôte, la nature de l’élimination des larves surnuméraires sont discutés.

Summary

When lepidopterous eggs of varied ages (1 hour to 5 days) are offered to parasitic females ofPhanerotoma flavitestacea Fisch., the location where the parasitic egg is deposited, depends on the developmental stage of the host egg at the time of oviposition.

When the host egg is 1 hour to 3 days old, the laying takes place in the yolk. On the other hand, if the parasite egg is deposited in a four day old or an older host egg, it is directly laid in the host embryo.

According to these results, it seems that the penetration of the parasitic egg or larva is only a passive movement caused by the migration of the yolk into the midgut of the host embryo.

These different points and the effect of the sting of the ovipositor on the host embryo, the nature of the elimination of the supernumerary larva, are discussed.

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Hawlitzky, N. Devenir de l’œuf et comportement de la larve dePhanerotoma flavitestacea [Hym.: Braconidae] lorsque la femelle pond dans des œufs d’Anagasta kuehniella [Lep.: Pyralidae] ayant atteint des stades de développement variés. Entomophaga 24, 237–245 (1979). https://doi.org/10.1007/BF02374237

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