Abundance and parasitism of clover root weevil (<i>Sitona lepidus</i>) and Argentine stem weevil (<i>Listronotus bonariensis</i>) in pastures


  • P.J. Gerard
  • M. Vasse
  • D.J. Wilson




The period from 2006 to 2010 in the North Island encompasses the widespread establishment of Irish Microctonus aethiopoides for the biocontrol of clover root weevil (Sitona lepidus) and a severe drought in 2008 that greatly reduced host availability This parasitoid occupies the same pasture habitat as Microctonus hyperodae a parasitoid with a similar life cycle introduced to control Argentine stem weevil (Listronotus bonariensis) A retrospective study was carried out on L bonariensis data and stored samples collected during S lepidus studies It was found that at all four initial M aethiopoides release sites L bonariensis populations were lowest in 2007 and 2008 while S lepidus populations were lowest in 2008 and 2009 Microctonus hyperodae parasitism levels were lowest in 2009 with overall regional means ranging from 5 in Manawatu to 11 in Waikato whereas corresponding Irish M aethiopoides parasitism levels were 43 and 72 respectively




How to Cite

Gerard, P.J., M. Vasse, and D.J. Wilson. “Abundance and Parasitism of Clover Root Weevil (&lt;i&gt;Sitona lepidus&lt;/i&gt;) and Argentine Stem Weevil (&lt;i&gt;Listronotus bonariensis&lt;/i&Gt;) in Pastures”. New Zealand Plant Protection 65 (January 8, 2012): 180–185. Accessed December 3, 2023. https://journal.nzpps.org/index.php/nzpp/article/view/5391.