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Imidazolinone and Sulfonylurea Resistance in a Biotype of Common Waterhemp (Amaranthus rudis)

Published online by Cambridge University Press:  12 June 2017

Sarah Taylor Lovell ,
Loyd M. Wax ,
Michael J. Horak  and
Dallas E. Peterson
Sarah Taylor Lovell
Affiliation:
Dep. of Agron., Univ. Illinois
Loyd M. Wax
Affiliation:
USDA/ARS, Crop Protection Res., Dep. of Agron., Univ Illinois, Urbana, IL 61801
Michael J. Horak
Affiliation:
Dep. of Agron., Kansas State Univ.
Dallas E. Peterson
Affiliation:
Dep. of Agron., Kansas State Univ., Manhattan KS 66506
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Abstract

The incidence of weed resistance to acetolactate synthase (ALS) inhibiting herbicides has increased in the United States. In 1993, a population of ALS-resistant common waterhemp was discovered after two confirmed applications of an imidazolinone herbicide. Following another imazethapyr application in the glasshouse, the resistant biotype demonstrated 130-fold resistance to imazethapyr at the whole plant level. The concentration of imazethapyr required to inhibit the ALS activity by 50% was 520 times greater for the resistant biotype than the susceptible. Plants also demonstrated cross-resistance to the sulfonylureas, chlorimuron and thifensulfuron, at the whole plant and enzyme levels. This particular discovery is of concern due to the low number of applications of the selection agent (imazaquin 1989, imazethapyr 1992, and imazethapyr in the greenhouse) and the high degree of cross-resistance eliminating several options for weed control.

Keywords

Chlorimuron, 2-[[[[(4chloro-6-methoxy-2-pyrimidinyl) amino] carbonyl] amino] sulfonyl] benzoic acidimazethapyr, (±)-2-[4,5-dihydro-4methyl-4-(I-methylethyl)-5-oxo-IH-imidazol-2-y1]-3-pyridi-necarboxylic acidthifensulfuron, 3-[[[[(4-methoxy-6methyl-l,3,5-triazin-2-yI)amino]carbonyl]amino]sulfonyl]2-thiophenecarboxylic acidcommon waterhemp Amaral/thus rudis Sauer # AMARUHerbicide resistancecross-resistanceacetolactate synthase
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 4 , December 1996 , pp. 789 - 794
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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