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Interactions of Sethoxydim and Corn (Zea mays) Postemergence Broadleaf Herbicides on Three Annual Grasses

Published online by Cambridge University Press:  12 June 2017

Bryan G. Young ,
Stephen E. Hart  and
Loyd M. Wax
Bryan G. Young
Affiliation:
Crop Science Dep., Univ. of Illinois and USDA-ARS, Urbana, IL 61801
Stephen E. Hart
Affiliation:
Crop Science Dep., Univ. of Illinois and USDA-ARS, Urbana, IL 61801
Loyd M. Wax
Affiliation:
Crop Science Dep., Univ. of Illinois and USDA-ARS, Urbana, IL 61801
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Abstract

Greenhouse and laboratory studies were conducted to determine the effect of 22 postemergence corn broadleaf herbicide combinations on the efficacy of sethoxydim applied to giant foxtail, large crabgrass, and shattercane. Eighteen combinations caused a reduction in sethoxydim efficacy on at least one grass species. Dicamba, atrazine plus dicamba, atrazine plus bentazon, bromoxynil, primisulfuron, CGA-152005 plus primisulfuron, MON 12000, and flumetsulam plus clopyralid plus 2,4-D (NAF-73) were evaluated further on the efficacy and foliar absorption of sethoxydim applied to giant foxtail, large crabgrass, and shattercane. In timing studies, applying all herbicide combinations at 7 or 3 d before sethoxydim application eliminated significant antagonistic interactions. However, applying NAF-73, primisulfuron, or CGA-152005 plus primisulfuron 1 d prior resulted in a reduction in sethoxydim efficacy on at least one grass species. Dicamba, atrazine plus dicamba, and atrazine plus bentazon decreased 14C-sethoxydim absorption 9 to 63% across grass species. Replacing crop oil concentrate (COC) with DASH increased sethoxydim absorption when applied with these herbicides but not to the full extent of sethoxydim applied alone with DASH. Sethoxydim efficacy was retained or improved with DASH when applied with dicamba, atrazine plus dicamba, atrazine plus bentazon, or bromoxynil. When primisulfuron, CGA-152005 plus primisulfuron, MON 12000, or NAF-73 was applied with 14C-sethoxydim no effect on sethoxydim absorption was observed. DASH was less effective than COC at restoring sethoxydim efficacy when applied with these herbicides.

Keywords

bromoxynil, 3,5-dibromo-4-hydroxybenzonitrileclopyralid, 3,6-dichloro-2-pyridinecarboxylic acid2,4-D, (2,4-dichlorophenoxy)acetic aciddicamba, 3,6-dichloro-2-methoxybenzoic acidDASH, high concentrate, oil-based adjuvantgiant foxtail, Setaria faberi Herrm. # SETFAlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAshattercane, Sorghum bicolor (L.) Moench # SORVUcorn, Zea mays L.Adjuvantherbicide antagonismDigitaria sanguinalisSetaria faberiSorghum bicolorDIGSASETFASORVU
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 914 - 922
Copyright
Copyright © 1996 by the Weed Science Society of America 

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