Intraguild predation involving Harmonia axyridis: a review of current knowledge and future perspectives

  • Judith K. PellEmail author
  • Jason Baverstock
  • Helen E. Roy
  • Remy L. Ware
  • Michael E. N. Majerus


As an effective generalist predator of aphids and other hemipteran pests H. axyridis has been a successful biological control agent. However, the very functional traits that have contributed to its success in this regard also implicate it as an intraguild predator that poses a significant risk not only to the diversity of other natural enemies of Hemiptera (and their associated ecosystem services), but to biodiversity more widely. In this paper we will specifically review the existing data on intraguild predation involving H. axyridis, and consider the strength and symmetry of such interactions both within its native guild and within exotic guilds where it has established as an invasive alien. We will use these studies to interpret the observed population declines in predator diversity in the field, predict species at risk in regions not yet invaded and consider implications for resulting ecosystem services. We will also indicate gaps in our knowledge that require further study in order to identify opportunities for mitigation.


Coccinellidae Harmonia axyridis Aphidophagous guild Intraguild predation Predators Parasitoids Pathogens Ecosystem services 


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Copyright information

© International Organization for Biological Control (IOBC) 2007

Authors and Affiliations

  • Judith K. Pell
    • 1
    Email author
  • Jason Baverstock
    • 1
  • Helen E. Roy
    • 2
  • Remy L. Ware
    • 3
  • Michael E. N. Majerus
    • 3
  1. 1.Department of Plant and Invertebrate EcologyRothamsted ResearchHertfordshireUK
  2. 2.NERC Centre for Ecology and HydrologyHuntingdonUK
  3. 3.Department of GeneticsUniversity of CambridgeCambridgeUK

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