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Influence of CGA-277476 on Efficacy of Postemergence Graminicides

Published online by Cambridge University Press:  12 June 2017

Eric W. Palmer ,
David R. Shaw  and
James C. Holloway JR.
Eric W. Palmer
Affiliation:
Department of Plant and Soil Sciences, Box 9555, Mississippi State University, Mississippi State, MS 39762
David R. Shaw*
Affiliation:
Department of Plant and Soil Sciences, Box 9555, Mississippi State University, Mississippi State, MS 39762
James C. Holloway JR.
Affiliation:
Novartis Crop Protection Corporation, Delta Research Station, Greenville, MS 38701
*
Corresponding author's E-mail: [email protected].
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Abstract

Field experiments were conducted at three Mississippi locations to evaluate potential antagonism when postemergence graminicides were tank-mixed with CGA-277476 and to determine if the antagonism could be overcome with an increase in graminicide rate. At all locations when the 1X rate of clethodim, fluazifop-P, or quizalofop was tank-mixed with 79 g ai/ ha CGA-277476, johnsongrass, broadleaf signalgrass, and barnyardgrass control was reduced 5 to 30%. When the graminicide rates were increased to 1.5X, antagonism was still present for fluazifop-P and quizalofop. However, 156 g ai/ha clethodim overcame the antagonism when tank-mixed with 79 g/ha CGA-277476 compared to 105 g/ha clethodim. CGA-277476 alone controlled barnyardgrass and broadleaf signalgrass 38 to 63% and johnsongrass 60 to 85%. There were no differences in soybean yields with graminicides applied alone or tank-mixed with CGA-277476.

Keywords

CGA-277476, 2[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-, 3-oxetanyl-esterclethodim, (E,E)-(±)-2-[1-[[(3-chloro-2propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefluazifop-P, (R)-2-[4-[[5-trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGbroadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash # BRAPPjohnsongrass, Sorghum halepense (L.) Pers. # SORHAsoybean, Glycine max (L.) Merr. ‘Hartz 4994,’ ‘Pioneer 9592.'AntagonismBrachiaria platyphyllaEchinochloa crus-galliSorghum halepenseBRAPPECHCGSORHAGrn, GreenvillePOST, postemergenceStk-N, Starkville northStk-S, Starkville southWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 13 , Issue 1 , March 1999 , pp. 48 - 53
Copyright
Copyright © 1999 by the Weed Science Society of America 

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