Abstract
In the laboratory, competition was determined betweenApanteles melanoscelus Ratzeburg andRogas lymantriae Watanabe by rearing both in the same gypsy moth,Lymantria dispar (L.), hosts. Each parasite attacked larvae previously parasitized by its competitor; neither parasite was excluded by the action of the other, but those that attacked first were more successful. Of 600 competitive interactions tested, only 1 gypsy moth larva yielded both parasite species. Percentage of parasitism was not significantly reduced, which suggests thatA. melanoscelus andR. lymantriae are intrinsically compatible and that establishment ofR. lymantriae in the United States could provide an additional benefit for gypsy moth control.
Résumé
Au laboratoire, la compétition entreApanteles melanoscelus Ratzeburg etRogas lymantriae a été étudiée en élevant les 2 parasites dans la même chenille-hôte,Lymantria dispar (L.). Chacun d'eux attaque les larves déjà parasitées par son compétiteur, aucun parasite n'est exclu par l'action de l'autre mais ce sont ceux qui sont intervenus les premiers qui ont le plus de succès. Au cours des 600 interactions de compétitions réalisées, seule 1 chenille deLymantria renferma les 2 espèces de parasite. Le pourcentage de parasitisme n'a pas été diminué de manière significative, ce qui suggère queA. melanoscelus etR. lymantriae sont compatibles entre eux et que l'établissement aux Etats Unis deR. lymantriae pourrait apporter un auxiliaire complémentaire pour la lutte contreL. dispar.
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Wallner, W.E., Weseloh, R.M. & Grinberg, P.S. Intrinsic competition betweenApanteles melanoscelus [Hym.: Braconidae] andRogas lymantriae [Hym.: Braconidae] reared onLymantria dispar [Lep.: Lymantriidae] . Entomophaga 27, 99–103 (1982). https://doi.org/10.1007/BF02371942
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DOI: https://doi.org/10.1007/BF02371942