Parasitism by <i>Microctonus aethiopoides</i> on a novel host <i>Listronotus bonariensis</i> in Canterbury pastures

Authors

  • M.R. McNeill
  • J.M. Kean
  • S.L. Goldson

DOI:

https://doi.org/10.30843/nzpp.2002.55.3953

Abstract

The parasitoids Microctonus aethiopoides and M hyperodae have been introduced as biological control agents against Sitona discoideus and Argentine stem weevil Listronotus bonariensis respectively Collections from ryegrass/white clover pastures in midCanterbury found that M aethiopoides was widespread in L bonariensis despite the weevil being a novel host Microctonus aethiopoides was recovered from 83 of the 65 sites sampled in Canterbury with parasitism rates of 0419 Studies in lucerne crops showed that M aethiopoides preferentially parasitised its natural host S discoideus although in some cases up to 10 of L bonariensis found in the lucerne were parasitised A possible reason for the prevalence of M aethiopoides in Canterbury pasture was that the widelydispersive flights of S discoideus from aestivation sites provided a source for reinfection of the parasitoid into ryegrass pasture Analysis of field parasitism suggested that parasitism of L bonariensis by M aethiopoides was negatively correlated with parasitism by M hyperodae

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Published

2002-08-01

How to Cite

McNeill, M., Kean, J., & Goldson, S. (2002). Parasitism by <i>Microctonus aethiopoides</i> on a novel host <i>Listronotus bonariensis</i> in Canterbury pastures. New Zealand Plant Protection, 55, 280-286. https://doi.org/10.30843/nzpp.2002.55.3953

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