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Biological differences reflect host preference in two parasitoids attacking the bark beetle Ips typographus (Coleoptera: Scolytidae) in Belgium

Published online by Cambridge University Press:  09 March 2007

E. Hougardy  and
J.-C. Grégoire
E. Hougardy*
Affiliation:
Lutte biologique et Ecologie spatiale CP 160/12, Université Libre de Bruxelles, 50 av. F.D. Roosevelt, 1050 Bruxelles, Belgium
J.-C. Grégoire
Affiliation:
Lutte biologique et Ecologie spatiale CP 160/12, Université Libre de Bruxelles, 50 av. F.D. Roosevelt, 1050 Bruxelles, Belgium
*
*Present address: ESPM Insect Biology, Wellman Hall 201, University of California, Berkeley, CA 94720–3112, USA Fax: (510) 642 7428 E-mail: ehougard@nature.berkeley.edu
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Abstract

The basic reproductive biology of two ectoparasitoids developing on the late larval instars of the scolytid Ips typographus Linnaeus, a pest of spruce forests in Eurasia, was studied with the purpose of explaining which biological features allow the two species to share the same host. The anautogenous braconid Coeloides bostrichorum Giraud had a longer pre-oviposition period (5.1 vs. 3.3 days), a greater egg load (8.1 vs. 6.1 eggs), survived longer and emerged later than the pteromalid Rhopalicus tutela (Walker). In contrast, R. tutela was autogenous and tended to be more fecund under constrained conditions (9.7 vs. 5.1 total offspring per female). The longer pre-oviposition period of the specialist C. bostrichorum, coupled with its greater longevity, afforded the opportunity of better synchronization of ovipositing females with late instar larvae of I. typographus. By contrast, the polyphagous R. tutela matured rapidly, allowing parasitism of both younger and older larval instars of I. typographus in addition to other species. These small differences favoured the co-occurrence of the two parasitoid species on the same attacked trees.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 94 , Issue 4 , August 2004 , pp. 341 - 347
Copyright
Copyright © Cambridge University Press 2004

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