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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
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: [email protected].

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.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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