An evaluation of the resistance of annual and perennial ryegrass to herbicides

  • M. Gunnarsson Foundation for Arable Research, P.O. Box 23133, Templeton, Christchurch 8445, New Zealand
  • T.K. James AgResearch Ltd., Ruakura Research Centre, Private Bag 3123, Hamilton 3240, New Zealand
  • R.J. Chynoweth Foundation for Arable Research, P.O. Box 23133, Templeton, Christchurch 8445, New Zealand
  • M.P. Rolston Foundation for Arable Research, P.O. Box 23133, Templeton, Christchurch 8445, New Zealand

Abstract

Ryegrass, both perennial (Lolium perenne) and annual (L. multiflorum), can be weeds in other arable crops such as wheat (Triticum aestivum). They are generally removed using selective herbicides, but herbicide-resistant perennial and annual ryegrasses have been reported anecdotally. Perennial ryegrass seeds that were suspected to be herbicide resistant were sourced from near Methven, Canterbury. They were evaluated for tolerance to five herbicides and were found to be resistant to all of them. In a separate experiment, annual ryegrass seeds that were suspected to be herbicide resistant were also sourced from near Methven, Canterbury. They were evaluated for tolerance to six different herbicides and were found to be resistant to haloxyfop applied at up to four times label rate but susceptible to clethodim. These results have important implications for growers and advisers throughout New Zealand.

Published
2017-07-24
How to Cite
GUNNARSSON, M. et al. An evaluation of the resistance of annual and perennial ryegrass to herbicides. New Zealand Plant Protection, [S.l.], v. 70, p. 165-170, july 2017. ISSN 1179-352X. Available at: <http://journal.nzpps.org/index.php/nzpp/article/view/45>. Date accessed: 19 nov. 2017.
Section
Weeds

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