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Antagonism of Graminicide Activity on Annual Grass Species by Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Paul F. Myers  and
Harold D. Coble
Paul F. Myers
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27695-7620
Harold D. Coble
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27695-7620
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Abstract

The interaction of imazethapyr and selected graminicides on annual grass control was studied in field experiments. Tank-mix combinations of imazethapyr with clethodim, fluazifop-P, quizalofop, or sethoxydim resulted in an antagonistic interaction. Control of large crabgrass, fall panicum, and broadleaf signalgrass by each graminicide decreased when tank-mixed with imazethapyr as compared with each graminicide applied alone. Sequential applications of imazethapyr, relative to each graminicide, successfully overcame the antagonism. Imazethapyr applied 5 d before or 1 d after each of the graminicides did not decrease grass weed control compared with each graminicide alone. Imazethapyr applied 3 or 1 d before, or the same day as the graminicides, generally decreased grass weed control.

Keywords

Clethodim, (E,E)-(±)2-[1-[[(3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidquizalofop, (±)-2-[4[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onebroadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash ♯ BRAPPfall panicum, Panicum dichotomiflorum Michx. ♯ PANDIlarge crabgrass, Digitaria sanguinalis (L.) Scop. ♯ DIGSATank-mixturesequential applicationsclethodimfluazifop-PquizalofopsethoxydimBRAPPDIGSAPANDI
Type
Research
Information
Weed Technology , Volume 6 , Issue 2 , June 1992 , pp. 333 - 338
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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