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


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



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




How to Cite

McNeill, M.R., J.M. Kean, and S.L. Goldson. “Parasitism by &lt;i&gt;Microctonus aethiopoides&lt;/i&gt; on a Novel Host &lt;i&gt;Listronotus bonariensis&lt;/i&gt; In Canterbury Pastures”. New Zealand Plant Protection 55 (August 1, 2002): 280–286. Accessed February 23, 2024.