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Multiparasitism of Choristoneura fumiferana by the ichneumonid Tranosema rostrale and the tachinid Actia interrupta: occurrence in the field and outcome of competition under laboratory conditions by Michel Cusson; Marlène Laforge; Jacques Régnière; Catherine Béliveau; Diane Trudel; J.-Claude Thireau; Guy Bellemare; Natalie Keirstead; Don Stolz is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract __Tranosema rostrale__ (Brishke) (Hymenoptera, Ichneumonidae) and __Actia interrupta__ Curran (Hymenoptera: Tachinidae) are the two endoparasitoids most frequently encountered in low‐density populations of the spruce budworm, __Choristoneura fumiferana__ (Clemens) (Lepidoptera, Tortricidae), in the Quebec City region. Monitoring of attack rates of implanted __C. fumiferana__ larvae at two different study sites suggested the possible existence of competition between the two parasitoids, with __A. interrupta__ seemingly displacing __T. rostrale__. Here, we show that multiparasitism involving these two species does occur in the field, but at a frequency too low to explain the seasonal pattern of decline in apparent parasitism by __T. rostrale__ that accompanies the rise of __A. interrupta__ attack rates. We also provide preliminary evidence, from laboratory experiments, that __A. interrupta__ has a competitive advantage over __T. rostrale__ and that the success of parasitism by __A. interrupta__ may be enhanced by prior parasitism by __T. rostrale__ under certain conditions, possibly due to the presence of the latter species' polydnavirus. In addition, we describe a PCR‐ba

Who reads Multiparasitism of Choristoneura fumiferana by the ichneumonid Tranosema rostrale and the tachinid Actia interrupta: occurrence in the field and outcome of competition under laboratory conditions?

Author

Michel Cusson; Marlène Laforge; Jacques Régnière; Catherine Béliveau; Diane Trudel; J.-Claude Thireau; Guy Bellemare; Natalie Keirstead; Don Stolz

Publisher

Springer; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0013-8703)

Published

2002

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)