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Wild Mustard (Brassica kaber) Resistance to Ethametsulfuron But Not to Other Herbicides

Published online by Cambridge University Press:  12 June 2017

G. Mark Jeffers ,
John T. O'Donovan  and
Linda M. Hall
G. Mark Jeffers
Affiliation:
Alberta Environmental Centre, Vegreville, Alberta, Canada T9C 1T4
John T. O'Donovan
Affiliation:
Alberta Environmental Centre, Vegreville, Alberta, Canada T9C 1T4
Linda M. Hall
Affiliation:
Alberta Agriculture, Food and Rural Development, 6909-116 St., Edmonton, Alberta, Canada T6H 4P2
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Abstract

In 1993, a wild mustard population growing in a canola crop near Wetaskiwin, AB was poorly controlled by ethametsulfuron after only one previous use of the herbicide. Controlled environment experiments were conducted to compare the response of this suspected resistant population (R) with that of a known susceptible population (S) collected near Vegreville, AB to increasing rates of ethametsulfuron, metsulfuron, chlorsulfuron, thifensulfuron, HOE 075032, imazamethabenz, imazethapyr, metribuzin, and 2,4-D. The R wild mustard population was highly resistant to ethametsulfuron, slightly resistant to low rates of metsulfuron but not resistant to any of the other herbicides tested. This suggests that the mechanism of resistance may differ from that reported for other sulfonylurea and imidazolinone herbicides. Since resistance was documented after only 2 yr of ethametsulfuron use, the initial frequency of resistance to this herbicide in wild mustard populations may be very high. Dry weight of untreated plants did not differ significantly between the S and R populations suggesting little or no differences in competitiveness between them.

Keywords

Clorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-amino]carbonyl]benzenesulfonamideethametsulfuron, 2-[[[[[4-ethoxy-6-(methylamino)-1,3,5-triazin-2-yl-amino]carbonyl]amino]sulfonyl]benzoic acidHOE 075032, N-[[[[[4,6-dimethoxy-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl]-N-methyl-methanesulfonamideimazamethabenz, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-4(and 5)-methylbenzoic acid (3:2)imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onemetsulfuron, 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-amino]carbonyl]amino]sulfonyl]benzoic acidthifensulfuron, 3-[[[[(4-methoxy-6-mefhyl-1,3,5-triazin-2-yl)-amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acid2,4-D, (2,4-dichlorophenoxy) acetic acidwild mustard, Brassica kaber (D.C.) L.C. Wheeler # SINARHerbicide resistancesulfonylureaSINAR
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 847 - 850
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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