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Dicamba Antagonizes Grass Weed Control with Imazethapyr by Reducing Foliar Absorption

Published online by Cambridge University Press:  12 June 2017

Stephen E. Hart  and
Loyd M. Wax
Stephen E. Hart
Affiliation:
North Centr. Region, USDA-ARS, Dep. of Crop Sci., Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
Loyd M. Wax
Affiliation:
North Centr. Region, USDA-ARS, Dep. of Crop Sci., Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
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Abstract

Greenhouse and laboratory studies were conducted to determine the effects of tank-mixing the sodium salt of dicamba (Na-dicamba) with imazethapyr on the efficacy and foliar absorption of imazethapyr, applied with non-ionic surfactant (NIS) or methylated seed oil (MSO), by shattercane, giant foxtail, and large crabgrass. The effects of various salt formulations of dicamba and the addition of ammonium sulfate on efficacy, 14C-absorption and on foliar spray retention by the same species were also evaluated. Na-dicamba antagonized imazethapyr efficacy by reducing 14C-absorption. Using MSO instead of NIS prevented antagonism when Na-dicamba was applied at 70 and 140 g/ha and reduced the severity of the antagonism at greater application rates by greatly increasing 14C-absorption compared to NIS. Reductions in 14C-absorption and spray retention were due to the salt formulations of dicamba rather than the parent acid. The addition of ammonium sulfate prevented dicamba antagonism of imazethapyr toxicity to grassy weeds by maintaining 14C foliar absorption and spray retention at normal levels.

Keywords

Dicamba, 3,6-dichloro-2-methoxybenzoic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidgiant foxtail, Setaria faberi Herrm. # SETFAlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAshattercane, Sorghum bicolor (L.) Moench # SORVUHerbicide antagonismDigitaria sanguinalisSetaria faberiSorghum bicolorDIGSASETFASORVU
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 828 - 834
Copyright
Copyright © 1996 by the Weed Science Society of America 

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