New Zealand Plant Protection 68 (2015): 204-211
This paper reports on an extensive field investigation conducted at Lincoln during the 2014-2015 summer/early autumn. This aimed to assess the effects of a range of novel EpichloŽ endophytes when present in different cultivars of Lolium spp. on parasitism rates by the biological control agent, Microctonus hyperodae, in Listronotus bonariensis (i.e. the Argentine stem weevil). Results for the entire summer, and including all treatment combinations, did not find any significant differences in parasitism in L. bonariensis populations. However, in the early autumn, independent of the endophytes present, significantly higher levels of parasitism were found in a tetraploid Lolium multiflorum cultivar and a tetraploid L. perenne selection compared to the L. perenne cultivars. Whether this finding has any bearing on a possible mechanism of weevil resistance is discussed.
Keywords: Argentine stem weevil, decline, Lolium multiflorum, Lolium perenne, parasitism rates, parasitoid, pasture pest, resistance.
|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
|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
|Ryegrass endophyte infection affects Argentine stem weevil adult behaviour and susceptibility to parasitism|
P.J. Gerard (2000)
New Zealand Plant Protection 53: 406-409
Copyright © 2015 New Zealand Plant Protection Society (Inc.).