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Evolved Resistance to Glyphosate in Rigid Ryegrass (Lolium rigidum) in Australia

Stephen B. Powles, Debrah F. Lorraine-Colwill, James J. Dellow and Christopher Preston
Weed Science
Vol. 46, No. 5 (Sep. - Oct., 1998), pp. 604-607
Stable URL: http://www.jstor.org/stable/4045968
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Evolved Resistance to Glyphosate in Rigid Ryegrass (Lolium rigidum) in 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, simazine, or tralkoxydim. The presence of glyphosate resistance in a major weed species indicates a need for changes in glyphosate use patterns.

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