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Selective Postemergence Herbicidal Control of Johnsongrass (Sorghum halepense) in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

B. A. Swisher
Affiliation:
Plant and Soil Sci. Dep., Southern Illinois Univ., Carbondale, IL 62901
George Kapusta
Affiliation:
Plant and Soil Sci. Dep., Southern Illinois Univ., Carbondale, IL 62901

Abstract

Two yr of field research were conducted to evaluate the efficacy of BAS-9021 {2-[1-(N-allyloxyamino)butylidene]-5,5-dimethyl-4-methoxycarbonylcyclohexane-1,3-dione, Na salt}, HOE 29152 {methyl 2-[4-(4-trifluoromethylphenoxy)phenoxy]propanoate}, and mefluidide N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl] amino] phenyl] acetamide as selective herbicides applied postemergence to johnsongrass [Sorghum halepense (L.) Pers.]. All three herbicides afforded 85% or greater control of rhizome johnsongrass in one experiment in 1977, where repeat applications were made and ideal growing conditions prevailed. HOE 29152 also afforded excellent control with a single application made at the boot stage of johnsongrass. In a second experiment in 1977, when drought conditions prevailed, HOE 29152 was the only herbicide that afforded 70% or greater control of the johnsongrass. Both BAS-9021 and mefluidide afforded less than 60% control of johnsongrass in the single 1978 experiment, when evaluated at the end of the season. This study also was subject to drought conditions throughout the growing season.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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References

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