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Interspecific competition between two generalist parasitoids that attack the leafroller Epiphyas postvittana (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  09 January 2015

Y. Feng ,
S. Wratten ,
H. Sandhu  and
M. Keller
Y. Feng
Affiliation:
School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia
S. Wratten
Affiliation:
Bio-Protection Research Centre, Lincoln University, PO Box 85084, Lincoln 7647, New Zealand
H. Sandhu
Affiliation:
School of the Environment, Flinders University, PO Box 2100 Adelaide, SA 5001, Australia
M. Keller*
Affiliation:
School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia
*
*Author for correspondence Phone: +61-8-8313-6713 E-mail: mike.keller@adelaide.edu.au
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Abstract

Two generalist parasitoids, Dolichogenidea tasmanica (Cameron) (Hymenoptera: Braconidae) and Therophilus unimaculatus (Turner) (Hymenoptera: Braconidae) attack early instars of tortricid moths, including the light brown apple moth, Epiphyas postvittana (Walker) (Lepidoptera: Tortricidae). The two parasitoids co-exist in natural habitats, while D. tasmanica is dominant in vineyards, whereas T. unimaculatus occurs mainly in adjacent native vegetation. This difference suggests possible competition between the two species, mediated by habitat. Here, we report on the extent of interspecific differences in host discrimination and the outcome of interspecific competition between the two parasitoids. The parasitoids did not show different behavioural responses to un-parasitized hosts or those that were parasitized by the other species. Larvae of D. tasmanica out-competed those of T. unimaculatus, irrespective of the order or interval between attacks by the two species. The host larvae that were attacked by two parasitoids died more frequently before a parasitoid completed its larval development than those that were attacked by a single parasitoid. Dissection of host larvae parasitized by both species indicated that first instars of D. tasmanica attacked and killed larval T. unimaculatus.

Keywords

host discriminationlight brown apple mothintrinsic competitionsearching behaviourparasitoidDolichogenidea tasmanicaTherophilus unimaculatus
Type
Research Papers
Information
Bulletin of Entomological Research , Volume 105 , Issue 4 , August 2015 , pp. 426 - 433
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Copyright
Copyright © Cambridge University Press 2015 

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