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Control of Imazethapyr-Resistant Common Sunflower (Helianthus annuus) in Soybean (Glycine max) and Corn (Zea mays)

Published online by Cambridge University Press:  20 January 2017

Kassim Al-Khatib*
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Dallas E. Peterson
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
David L. Regehr
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
*
Corresponding author's E-mail: [email protected].

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.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Contribution 99-487-J from the Kansas Agricultural Experiment Station

References

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