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Does host plant influence parasitism and parasitoid species composition in Lygus rugulipennis? A molecular approach

Published online by Cambridge University Press:  28 April 2008

T.D. Gariepy ,
U. Kuhlmann ,
C. Gillott  and
M. Erlandson
T.D. Gariepy*
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada CABI Europe-Switzerland, Delémont, Switzerland
U. Kuhlmann
Affiliation:
CABI Europe-Switzerland, Delémont, Switzerland
C. Gillott
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
M. Erlandson
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, Saskatoon, Saskatchewan, Canada
*
*Author for correspondence Fax: +1 808 822 2190 E-mail: [email protected]
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Abstract

Lygus Hahn plant bugs (Hemiptera: Miridae) are serious pests of a wide variety of economically important crops in North America. European Peristenus digoneutis Loan and P. relictus Ruthe (Hymenoptera: Braconidae) are being considered for release in Canada as part of a classical biological control program for Lygus. The attractiveness of different host plants to European Peristenus has not been addressed, but may be an important consideration prior to parasitoid release. Lygus rugulipennis Poppius nymphs were collected in the Northern Temperate Atlantic (NTA) ecoregion on red clover (Trifolium pratense L.; Fabaceae) and chamomile (Matricaria recutita L.; Asteraceae), and in the Western European Broadleaf Forest (WEBF) ecoregion on red clover and alfalfa (Medicago sativa L.; Fabaceae). Parasitism levels and parasitoid species were determined using a multiplex PCR assay for P. digoneutis, P. relictus, and P. pallipes Curtis. Mean parasitism levels in L. rugulipennis were 45–49% in the NTA ecoregion and 25–32% in the WEBF ecoregion. However, in neither ecoregion were parasitism levels and parasitoid species compositions significantly different in nymphs from different host plant species. Furthermore, multiparasitism was low despite the fact that P. digoneutis and P. relictus share the same host species.

Keywords

LygusPeristenusmolecular diagnosticshost-plant-parasitoid associationstritrophic interactionsmultiparasitism
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 98 , Issue 3 , June 2008 , pp. 217 - 221
Copyright
Copyright © 2008 Cambridge University Press

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