1 January 2000 Control of Imazethapyr-Resistant Common Sunflower (Helianthus annuus) in Soybean (Glycine max) and Corn (Zea mays)
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Abstract: Field experiments were conducted in 1997 and 1998 near Rossville in northeast Kansas to evaluate control of imazethapyr-resistant common sunflower with selected herbicides in corn and soybean. In soybean, common sunflower control was unacceptable with imazethapyr, chlorimuron, CGA-277476, and cloransulam applied alone. Lactofen or acifluorfen applied with these herbicides slightly improved control, whereas glyphosate applied with them controlled more than 97% of common sunflower. All herbicides reduced common sunflower populations in the corn. The greatest reductions occurred when atrazine was applied with dicamba, 2,4-D, RPA 201772, or CGA-152005 plus primisulfuron. These herbicide combinations also stunted common sunflower that survived treatment. Several herbicide alternatives are available to control imazethapyr-resistant common sunflower in corn. However, glyphosate was the only herbicide that gave adequate control in soybean.

Nomenclature: Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid; atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine; CGA-152005, 1-(4-methoxy-6-methyl-triazin-2-yl)-3-[2-(3,3,3-trifluoropropyl)-phenylsulfonyl]-urea; CGA-277476, 2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acid,3-oxetanyl-ester; chlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino] carbonyl]amino]sulfonyl]benzoic acid; cloransulam, 3-chloro-2-[[(5-ethoxy-7-fluoro[1,2,4]triazolo[1,5-c]pyrimidin-2yl)sulfonyl] amino]benzoic acid; 2,4-D, (2,4-dichlorophenoxy)acetic acid; dicamba, 3,6-dichloro-2-methoxybenzoic acid; glyphosate, N-(phosphonomethyl)glycine; imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid; lactofen, (±)-2-ethoxy-1-methyl-2-oxoethyl-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate; primisulfuron, 2-[[[[[4,6-bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl]benzoic acid; RPA 201772, 5-cyclopropyl-4-(2-methylsulphonyl-4-trifluoromethyl-benzoyl)isoxazole; common sunflower, Helianthus annuus L.; corn, Zea mays L. ‘Cargill 6997’; soybean, Glycine max (L.) Merr. ‘Stine 3264’.

Additional index words: Acifluorfen, atrazine, bromoxynil, CGA-152005, CGA-277476, chlorimuron, clopyralid, cloransulam, 2,4-D, dicamba, flumetsulam, glyphosate, imazethapyr, lactofen, metolachlor, primisulfuron, RPA 201772, rimsulfuron, thifensulfuron.

Abbreviations: ALS, acetolactate synthase; DAP, days after planting; DAT, days after treatment.

KASSIM AL-KHATIB, DALLAS E. PETERSON, and DAVID L. REGEHR "Control of Imazethapyr-Resistant Common Sunflower (Helianthus annuus) in Soybean (Glycine max) and Corn (Zea mays)," Weed Technology 14(1), 133-139, (1 January 2000). https://doi.org/10.1614/0890-037X(2000)014[0133:COIRCS]2.0.CO;2
Published: 1 January 2000
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