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Resistance to acetolactate synthase inhibitors and quinclorac in a biotype of false cleavers (Galium spurium)

Published online by Cambridge University Press:  12 June 2017

Linda M. Hall ,
Kim M. Stromme ,
Geoff P. Horsman  and
Malcolm D. Devine
Kim M. Stromme
Affiliation:
Agronomy Unit, Alberta Agriculture, Food and Rural Development, 6903 116 Street, Edmonton, Alberta, Canada T6H 4P2
Geoff P. Horsman
Affiliation:
Department of Crop Science and Plant Ecology, 51 Campus Drive, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8
Malcolm D. Devine
Affiliation:
Department of Crop Science and Plant Ecology, 51 Campus Drive, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8
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Abstract

A false cleavers population that survived treatment with triasulfuron/bromoxynil in 1996 was identified in central Alberta, Canada, in a field that had been treated with acetolactate synthase (ALS) inhibitors in 3 of the previous 6 yr. In greenhouse studies, this biotype was highly resistant to the ALS inhibitors triasulfuron, thifensulfuron/tribenuron, and sulfometuron and moderately resistant to imazethapyr; GR50, values were > 16, > 5, > 1.0, and 9.9, respectively. In addition, cross-resistance was identified to the auxin-type herbicide quinclorac (GR50 value > 6.7) but not to fluroxypyr (GR50 value 1) or MCPA/mecoprop/dicamba. Quinclorac had not been used previously in this field. Analysis of ALS extracted from the resistant biotype and a susceptible biotype from a nearby location indicated that resistance to ALS inhibitors was due to an altered target site with reduced sensitivity to a broad range of ALS inhibitors. The ALS I50 values for triasulfuron, metsulfuron, chlorsulfuron, thifensulfuron, and imazethapyr were 36, 34, 92, 96, and 14 times higher, respectively, for the resistant compared to the susceptible biotype. The mechanism of resistance to quinclorac is unknown. This is the first report of high-level herbicide resistance in this weed species.

Keywords

False cleavers, Galium spurium L. GALSP2,4-D; bromoxynilchlorsulfurondicambafluroxypyrglyphosateimazamoximazethapyrMCPAmecopropmetsulfuronquincloracsulfometuronthifensulfurontriasulfurontribenuronImidazolinonesulfonylureaherbicide resistanceGALSP
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 46 , Issue 4 , August 1998 , pp. 390 - 396
Copyright
Copyright © 1998 by the Weed Science Society of America 

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