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Host testing of Eadya daenerys, a potential biological control agent for the invasive chrysomelid pest Paropsis charybdis, predicts host specificity to eucalypt-leaf feeding Paropsina

  • T. M. WithersEmail author
  • C. L. Todoroki
  • G. R. Allen
  • A. R. Pugh
  • B. A. Gresham
Article
  • 29 Downloads

Abstract

Host range testing of a larval endoparasitoid Eadya daenerys Ridenbaugh (Hymenoptera: Braconidae) was conducted. Eadya daenerys is most commonly associated with Paropsisterna agricola (Chapuis) in Australia, but is proposed as a biological control agent for Paropsis charybdis Stål (Coleoptera: Chrysomelidae) in New Zealand. Nine species of non-target beetles with spring-active, external leaf-feeding larvae, were host tested. Development to emergence only occurred within eucalypt-feeding Paropsina pests: the target P. charybdis and another pest Trachymela sloanei (Blackburn). Unsuccessful internal parasitism occurred in four less closely related non-target Chrysomelinae. Considering the different feeding niches occupied by these beetles, we hypothesize that Eadya daenerys is unlikely to cause direct non-target impacts beyond pest Paropsina species in the New Zealand environment.

Keywords

Risk assessment Endemic beetle Weed biological control agents Eucalyptus pest 

Notes

Acknowledgements

Many thanks to other Scion staff including Andrew Dunningham, Justin Nairn, Matt Scott, Pam Taylor, Carl Wardhaugh, and University of Tasmania, Institute of Agriculture staff members Vin Patel and Steve Quarrell. Dean Satchell, New Zealand Farm Forestry Association has also been an invaluable contributor to this research. Students have also been highly valued for their assistance with this project, including Stephanie Kirk, Mike Davy, Sean Gatenby, Katherine Moors, Elise Peters and Amy Yasutake-Watson, in New Zealand, and Ray Ali, Hui Law, Meng Lim, Allanna Russell, and Rebekah Smart, in Australia. Thanks to landowners, including Forestry Tasmania, iFarm, PF Olsen, Oji Fibre Solutions (NZ) Ltd, the NZ Defence Force, the NZ Department of Conservation (DOC) and The Westervelt Company NZ Ltd for access to field sites for collecting. Thanks to Landcare Research scientists Ronny Groenteman, Hugh Gourlay, Chris Winks, Paul Peterson and Richard Leschen and AgResearch scientist Mike Cripps for their invaluable assistance with non-target beetles. Allocharis nr tarsalis were collected under DOC research authority 54216RES. Funding was from the New Zealand Ministry of Primary Industries Sustainable Farming Fund contracts 12-039 and 407964, and New Zealand Ministry of Business Innovation and Employment Strategic Science Investment Funding contract to Scion. Industry funding co-partners Southwood Exports Limited and Oji Fibre Solutions NZ Ltd, are gratefully acknowledged, as are the Speciality Wood Products Partnership, and the New Zealand Farm Forestry Association.

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Copyright information

© International Organization for Biological Control (IOBC) 2019

Authors and Affiliations

  • T. M. Withers
    • 1
    Email author
  • C. L. Todoroki
    • 1
  • G. R. Allen
    • 2
  • A. R. Pugh
    • 1
  • B. A. Gresham
    • 1
  1. 1.ScionRotoruaNew Zealand
  2. 2.Tasmanian Institute of Agriculture, University of TasmaniaHobartAustralia

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