Abstract
Field and laboratory choice tests in which searching adultEncarsia opulenta Silvestri were exposed to variable densities of citrus blackfly,Aleurocanthus woglumi Ashby, indicated the following: (1) a direct functional relationship between adult parasite aggregation and host density, resulting in (2) a direct density-dependent mortality ofA. woglumi within a single generation timespan. The implications of such nonrandom searching patterns byE. opulenta on stability of the host-parasite interaction on Texas citrus are discussed.
Résumé
Des tests réalisés en plein air et en laboratoire sur le choix offert aux adultes d'Encarsia opulenta Silvestri, exposés à des densités variables de l'Aleurode des Citrus:Aleurocanthus woglumi Ashby indiquent: (1) une relation fonctionnelle directe entre l'agrégation de parasites adultes et la densité-hôte, résultant (2) d'une mortalité directe dépendant de la densité d'A. woglumi en l'espace de temps d'une simple génération. Les implications de tels types de recherches non effectuées au hasard de la part d'E. opulenta sur la stabilité de l'interaction hôte-parasite sur les Citrus du Texas, sont discutées.
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Summy, K.R., Gilstrap, F.E. & Hart, W.G. Aleurocanthus woglumi [Hom.: Aleyrodidae] andEncarsia opulenta [Hym.: Encyrtidae]: Density-dependent relationship between adult parasite aggregation and mortality of the host. Entomophaga 30, 107–112 (1985). https://doi.org/10.1007/BF02372242
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DOI: https://doi.org/10.1007/BF02372242