Abstract
Before oviposition, Östrinianubilalis Hübner females sweep the surface of the plant with their abdominal tip extruded. The consequences of such behaviour were studied on host searching and oviposition behaviours of the parasitoidTrichogramma brassicae Bezdenko. Egg-masses ofO. nubilalis, associated or not with sweeping, were submitted toT. brassicae females. The behaviour ofT. brassicae females appeared to be very different between the two situations. The parasitoid in the vicinity of an egg-mass associated with sweeping spent more time on the corn leaf. Ninety percent of females located the egg-mass with sweeping, whereas only 40% located the egg-mass without sweeping. Eighty three percent ofT. brassicae females parasitized egg-masses with sweeping, but only 10% in the case without sweeping. Although no deposit was visible, a chemical trail was probably left behind and was found to arrest the parasitoid, to promote host recognition and to trigger oviposition. The amount of the scales left behind on the corn leaf during the sweeping behaviour was also taken into account but did not appear to constitute the trail. The passage over the trail followed by the egg-mass examination constituted behavioural steps which seemed necessary for oviposition in theT. brassicae female
Résumé
Avant de pondre, les femelles d’Ostrinia nubilalis balayent la surface du végétal avec leur extrémité abdominale dévaginée. Les conséquences d’un tel comportement sont étudiées sur les comportements de recherche et d’oviposition du parasitoïdeTrichogramma brassicae Bezdenko. Les femelles deT. brassicae sont mises en présence d’une ooplaque associée ou non à un balayage. Le comportement des femelles deT. brassicae est très différent entre les deux situations. Le temps de présence du parasitoïde sur la feuille de maïs, à proximité de l’ooplaque associée à un balayage, est plus important. Puis, 90 % des femelles trouvent l’ooplaque contre 40 % sans balayage. Enfin, 83 % parasitent l’oeuf hôte contre 10 % sans balayage. Bien qu’aucun dépôt ne soit visible, une trace de nature chimique est probablement déposée. Le parasitoïde se fixe sur cette trace. Elle favorise la reconnaissance de l’hôte et le déclenchement de la ponte. Le rôle des écailles, perdues sur le maïs lors du balayage, a également été pris en compte. Elles n’apparaissent pas constituer la trace. Le passage sur la trace suivi de la prospection de l’oeuf est une succession d’actes qui semblent nécessaires aux femelles deT. brassicae pour aboutir à l’oviposition
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Garnier-Geoffroy, F., Robert, P., Hawlitzky, N. et al. Oviposition behaviour inOstrinia nubilaus (Lep.: pyralidae) and consequences on host location and oviposition inTrichogramma brassicae (Hym.: Trichogrammatidae). Entomophaga 41, 287–299 (1996). https://doi.org/10.1007/BF02764254
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DOI: https://doi.org/10.1007/BF02764254