Massemergence devices to improve synchrony between <i>Listronotus bonariensis</i> and <i>Microctonus hyperodae</i>


  • P. Kehrli
  • C.B. Phillips



A novel approach to conserving and augmenting parasitoids involves storing large numbers of parasitised hosts in massemergence devices After eclosing inside the device parasitoid adults which are generally smaller than their hosts are allowed to escape through a mesh screen while any unparasitised hosts remain trapped The goal of this study was to assess the potential of massemergence devices both for augmenting populations of the parasitoid Microctonus hyperodae and for manipulating its synchrony with its host the Argentine stem weevil Listronotus bonariensis The experiments demonstrated that a screen with a 900 micro;m by 900 micro;m mesh is appropriate to separate parasitoid adults from their hosts and that a device of very simple design could be effective However the survival of L bonariensis and M hyperodae was reduced by cool storage and food deprivation and further development is required to overcome these limitations




How to Cite

Kehrli, P. and Phillips, C. 2006. Massemergence devices to improve synchrony between &lt;i&gt;Listronotus bonariensis&lt;/i&gt; and &lt;i&gt;Microctonus hyperodae&lt;/i&gt;. New Zealand Plant Protection. 59, (Aug. 2006), 172–177. DOI:




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