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Management of Acetolactate Synthase (ALS)-Resistant Common Sunflower (Helianthus annuus L.) in Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

Jayla R. Allen ,
William G. Johnson ,
Reid J. Smeda ,
William J. Wiebold  and
Raymond E. Massey
Jayla R. Allen
Affiliation:
Department of Agronomy
William G. Johnson*
Affiliation:
Department of Agronomy
Reid J. Smeda
Affiliation:
Department of Agronomy
William J. Wiebold
Affiliation:
Department of Agronomy
Raymond E. Massey
Affiliation:
Department of Agricultural Economics, University of Missouri, Columbia, MO 65211
*
Corresponding author's E-mail: johnsonwg@missouri.edu.
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Abstract

Field studies were conducted in 1998 and 1999 to evaluate the sensitivity of a common sunflower population to acetolactate synthase (ALS)-inhibiting herbicides and evaluate alternative control methods for ALS-resistant common sunflower in soybean. Imazaquin, imazethapyr, imazamox, flumetsulam, chlorimuron, cloransulam, and CGA277476 provided 35 to 73% control of common sunflower with labeled rates. Postemergence glyphosate and sequential applications of bentazon effectively controlled ALS-resistant common sunflower. Although pendimethalin + imazaquin + imazethapyr preemergence followed by glyphosate postemergence with and without cultivation provided 100% control of ALS-resistant common sunflower, sequential applications of glyphosate provided net incomes approximately $50 to $110/ha higher than the alternative control methods. Pendimethalin preemergence followed by acifluorfen + bentazon postemergence followed by bentazon 10 d later provided the lowest overall weed control and net income. In treatments with a soil-applied herbicide followed by glyphosate postemergence, cultivation generally did not improve weed control. Soybean yields were the same comparing glyphosate with a soil-applied herbicide followed by glyphosate.

Keywords

Acifluorfen, bentazon, chlorimuron ethyl, cloransulam, flumetsulam, glyphosate, imazamox, imazaquin, imazethapyr, CGA277476, pendimethalin, common sunflower, Helianthus annuus L. # HELANsoybean, Glycine max (L.) Merr. ‘Asgrow 3601 RR∗STS’Cultivationherbicide resistancesulfentrazoneAmaranthus rudis SauerIpomoea hederaceae (L.) JacqSetaria faberi HerrmXanthium strumarium L.AMATAIPOHESETFAXANSTALS, acetolactate synthasecec, cation exchange capacityCV, coefficient of variationMPOST, mid postemergenceOM, organic matterPRE, preemergenceWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 15 , Issue 3 , September 2001 , pp. 571 - 575
Copyright
Copyright © Weed Science Society of America 

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