Abstract
Tetrastichus howardi (Olliff) preferred the lepidopteran hosts,Chilo partellus (Swinhoe) (Pyralidae) andHelicoverpa armigera (Hübner) (Noctuidae) to their parasitoids,Xanthopimpla stemmator (Thunberg) (Hymenoptera: Ichneumonidae) andPalexorista laxa (Curran) (Diptera: Tachinidae). IfT. howardi had previously experienced parasitising a certain host, its preference for that host increased, but not significantly. When reared on a certain host, the preference for that host increased.T. howardi showed no preference to any particular age of its hosts.T. howardi was able to discriminate between parasitised and unparasitised hosts, initially preferring parasitised hosts, but two days later preferring unparasitised hosts.
Résumé
Des expériences en laboratoire ont montré queTetrastichus howardi (Olliff) préfère, comme hôtes, les lépidoptères,Chilo partellus (Swinhoe) (Pyralidae) etHelicoverpa armigera (Hübner) (Noctuidae) à leurs parasitoïdes respectifs,Xanthopimpla stemmator (Thunberg) (Hym.: Ichneumonidae) etPalexorista laxa (Curran) (Dipt.: Tachinidae). SiT. howardi a déjà parasité auparavant un certain hôte, sa préférence pour cet hôte s'accroît mais pas significativement. Par ailleurs, quand il est élevé sur un hôte donné, sa préférence pour cet hôte augmente.T. howardi ne' montre par contre aucune préférence pour un stade particulier de son hôte. Il est capable de distinguer un hôte parasité d'un hôte non parasité et s'il préfère au début les hôtes parasités, il montre, au bout de deux jours, une préférence pour ceux qui ne le sont pas.
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Moore, S.D., Kfir, R. Host preference of the facultative hyperparasitoidTetrastichus howardi (Hym.: Eulophidae) . Entomophaga 40, 69–76 (1995). https://doi.org/10.1007/BF02372682
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DOI: https://doi.org/10.1007/BF02372682