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Evolved resistance to glyphosate in rigid ryegrass (Lolium rigidum) in Australia

Published online by Cambridge University Press:  12 June 2017

Stephen B. Powles ,
Debrah F. Lorraine-Colwill ,
James J. Dellow  and
Christopher Preston
Stephen B. Powles
Affiliation:
CRC for Weed Management Systems, Waite Campus, University of Adelaide, PMB 1 Glen Osmond SA 5064, Australia
Debrah F. Lorraine-Colwill
Affiliation:
Department of Crop Protection, Waite Campus, University of Adelaide, PMB 1 Glen Osmond SA 5064, Australia
James J. Dellow
Affiliation:
Agricultural Research Institute, NSW Agriculture and CRC for Weed Management Systems, Orange, NSW 2800, Australia
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Abstract

Following 15 yr of successful use, glyphosate failed to control a population of the widespread grass weed rigid ryegrass in Australia. This population proved to be resistant to glyphosate in pot dose-response experiments conducted outdoors, exhibiting 7- to 11-fold resistance when compared to a susceptible population. Some cross-resistance to diclofop-methyl (about 2.5-fold) was also observed. Similar levels of control of the resistant and susceptible populations were obtained following application of amitrole, chlorsulfuron, fluazifop-P-butyl, paraquat, sethoxydim, sirnazine, or tralkoxydim. The presence of glyphosate resistance in a major weed species indicates a need for changes in glyphosate use patterns.

Keywords

Amitrolechlorsulfurondiclofop-methylfluazifop-P-butylglyphosateparaquatsethoxydimsimazinetralkoxydimrigid ryegrass, Lolium rigidum Gaud. LOLRIHerbicide resistanceglyphosate resistanceLOLRI
Type
Weed Management
Information
Weed Science , Volume 46 , Issue 5 , October 1998 , pp. 604 - 607
Copyright
Copyright © 1998 by the Weed Science Society of America 

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Footnotes

Present address: Western Weeds Initiative, Faculty of Agriculture, University of Western Australia, Nedlands WA 6907, Australia

References

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