New Zealand Plant Protection 65 (2012): 180-185
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.
Keywords: Microctonus aethiopoides, Microctonus hyperodae, parasitoid, weevil, drought.
|The current status of Argentine stem weevil (Listronotus bonariensis) as a pest in the North Island of New Zealand|
A.J. Popay, M.R. McNeill, S.L. Goldson and C.M. Ferguson (2011)
New Zealand Plant Protection 64: 55-62
|Weevils in pasture: a comparison of sampling techniques|
M.R. McNeill and C. van Koten (2011)
New Zealand Plant Protection 64: 284
|Parasitism by Microctonus aethiopoides on a novel host, Listronotus bonariensis, in Canterbury pastures|
M.R. McNeill, J.M. Kean and S.L. Goldson (2002)
New Zealand Plant Protection 55: 280-286
|Potential to enhance the efficacy of Microctonus hyperodae Loan|
C.B. Phillips, J.R. Proffitt and S.L. Goldson (1998)
Proceedings of the NZ Plant Protection Conference 51: 16-22
Copyright © 2012 New Zealand Plant Protection Society (Inc.).