In:
NZGA: Research and Practice Series, New Zealand Grassland Association, Vol. 13 ( 2007-01-01), p. 301-306
Abstract:
To investigate the interaction between Argentine stem weevil (Listronotus bonariensis), its parasitoid Microctonus hyperodae, fungal endophyte (Neotyphodium lolii) and its grass host, four endophyte-ryegrass (Lolium perenne) treatments were established on four farms in Wairarapa in autumn 2003. A diploid ryegrass contained either wild-type or AR1 endophyte or was endophytefree, while a tetraploid ryegrass contained AR1 endophyte. Wild-type, AR1 and endophyte-free ryegrasses average 52%, 91% and 2% endophyte-infected tillers for the 3 years of measurement. Moderate increases over time in the proportion of wild-type infected tillers indicated selection pressures favoured endophyte-infected tillers. Endophyte-free tiller populations were 11% lower than AR1 or wild-type but not significantly so. L. bonariensis populations were highest in endophyte-free and wild-type pastures and 80% lower in AR1 pastures. Mean rates of parasitism in L. bonariensis were lower in spring (9%) than autumn (35%), tended to be higher in wild-type than in AR1 diploid ryegrass, and only had a weak relationship with percent endophyte-infection. Keywords: endophyte, Neotyphodium lolii, Lolium perenne, dry matter yields, plant persistence, Listronotus bonariensis, Microctonus hyperodae
Type of Medium:
Online Resource
ISSN:
2463-4751
,
0110-8581
DOI:
10.33584/rps.13.2006
DOI:
10.33584/rps.13.2006.3148
Language:
Unknown
Publisher:
New Zealand Grassland Association
Publication Date:
2007
SSG:
21
