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Cross-Resistance of Imazethapyr-Resistant Common Sunflower (Helianthus annuus) to Selected Imidazolinone, Sulfonylurea, and Triazolopyrimidine Herbicides

Published online by Cambridge University Press:  12 June 2017

Jolene R. Baumgartner ,
Kassim Al-Khatib  and
Randall S. Currie
Jolene R. Baumgartner
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66502
Kassim Al-Khatib*
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66502
Randall S. Currie
Affiliation:
Southwest Research-Extension Center, Kansas State University, Garden City, KS 67846
*
Corresponding author's E-mail: [email protected].
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Abstract

The study was conducted to determine the cross-resistance of imazethapyr-resistant common sunflower (Helianthus annuus) to selected imidazolinone, sulfonylurea, and triazolopyrimidine herbicides. Whole-plant herbicide dose–response curves and in vitro enzyme studies showed that imazethapyr-resistant common sunflower was highly resistant to imazamox, slightly resistant to thifensulfuron and chlorimuron, and not resistant to cloransulam. Resistance ratios of herbicide concentrations required to inhibit growth by 25% were 310, 3.3, 2.0, and 1.4 times greater in the resistant biotype than in the susceptible biotype for imazamox, thifensulfuron, chlorimuron, and cloransulam, respectively. Similarly, herbicide concentrations required to inhibit ALS activity in vitro by 25% were 332.0, 18.6, 8.3, and 1.2 times greater in the resistant biotype than in the sensitive biotype for imazamox, chlorimuron, thifensulfuron, and cloransulam, respectively.

Keywords

Chlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino] sulfonyl]benzoic acidcloransulam, 3-chloro-2-[[5-ethoxy-7-fluoro[1,2,4]triazolo[1-5-c]pyrimidin-2yl)sulfonyl]amino]benzoic acidimazamox, 2-[-4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-(methoxymethyl)-3-pyridinecarboxylic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidthifensulfuron, 3-[[[[4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acidcommon sunflower, Helianthus annuus L. # HELANHerbicide resistanceacetolactate synthaseALS, acetolactate synthaseGR25, herbicide concentration required to inhibit growth by 25%I25, herbicide concentration required to inhibit ALS activity by 25%R, resistantS, susceptible
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 489 - 493
Copyright
Copyright © 1999 by the Weed Science Society of America 

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