Full TGIF Record # 79603
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Web URL(s):http://www.grassland.org.nz/publications/nzgrassland_publication_298.pdf
    Last checked: 02/03/2017
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Author(s):Popay, A. J.; Baltus, J. G.
Author Affiliation:AgResearch, Ruakura Research Centre, Hamilton
Title:Black beetle damage to perennial ryegrass infected with AR1 endophyte
Section:Sustainable animal production systems
Other records with the "Sustainable animal production systems" Section
Source:Proceedings of the New Zealand Grassland Association. Vol. 63, October/November 2001, p. 267-271.
# of Pages:5
Publishing Information:Wellington: New Zealand Grassland Association
Keywords:TIC Keywords: Endophytic fungi; Lolium endophytes; Lolium perenne; Peramine; Listronotus bonariensis; Heteronychus arator; Insect resistance
Abstract/Contents:"AR1 is a new fungal endophyte that is being released in perennial ryegrass to New Zealand farmers. This endophyte lacks the mammalian toxins, ergovaline and lolitrem B, but produces peramine which provides resistance to a major ryegrass pest, Argentine stem weevil (Listronotus bonariensis). Black beetle (Heteronychus arator) is another important pest of ryegrass in northern areas of New Zealand. Adults are selective feeders, and avoid feeding on ryegrass infected with wild-type endophyte. A limited supply of sustainable food greatly reduces their reproductive capacity. Laboratory and field investigations were therefore carried out to evaluate the degree of resistance to black beetle provided by AR1. Assessments of adult black beetle feeding were made on two fields trials planted in autumn 1999. In both trials, adult feeding was significantly higher on ryegrass infected with AR1 than on ryegrass with wild-type but also significantly lower on AR1 than on endophyte-free ryegrass. In a pot trial conducted in summer, black beetle adult damage to a 4-week-old AR1-infected ryegrass was no different from damage to endophyte-free plants. However, in 6-month-old plants, damage to AR1 plants was significantly less than to endophyte-free plants and was similar to damage levels on wild-type plants. A further pot trial showed that beetles overwintering on AR1 ryegrass had a higher reproductive capacity than those overwintering on wild-type infected ryegrass. In February 2001, two field trials planted the previous June were sampled for black beetle larvae. Black beetle presence was significantly higher on endophyte-free plots than on wild-type plots, with presence on AR1 intermediate between those treatments. Ryegrass infected with AR1, although showing a degree of resistance to black beetle compared with endophyte-free ryegrass, is more susceptible to damage than wild-type, particularly in its first year of planting. Limited data indicate that older AR1 swards may have similar resistance to that of the wild-type but further research is needed to clarify the effect of stand maturity on black beetle damage to ryegrass infected with this new endophyte."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Popay, A. J., and J. G. Baltus. 2001. Black beetle damage to perennial ryegrass infected with AR1 endophyte. Proc. N.Z. Grassland Assoc. 63:p. 267-271.
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    Last checked: 02/03/2017
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