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Comparison of Graminicides Applied at Equivalent Costs in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

David L. Jordan ,
James L. Griffin ,
P. Roy Vidrine ,
David R. Shaw  and
Daniel B. Reynolds
David L. Jordan
Affiliation:
Northeast Research Station, Louisiana State University Agricultural Center, P.O. Box 4.38, St. Joseph, LA 71366
James L. Griffin
Affiliation:
Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, 302 Life Science Building, Baton Rouge, LA 70803
P. Roy Vidrine
Affiliation:
Dean Lee Research Station, Louisiana State University Agricultural Center, 8105 East Campus Avenue, Alexandria, LA 71302
David R. Shaw
Affiliation:
Department of Plant and Soil Science, Mississippi State University, 117 Dorman Hall, Box 9555, Mississippi State, MS 39762
Daniel B. Reynolds
Affiliation:
Department of Plant and Soil Science, Mississippi State University, 117 Dorman Hall, Box 9555, Mississippi State, MS 39762
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Abstract

Eleven field experiments were conducted during 1994 and 1995 to compare rhizomatous johnsongrass control and soybean yield with single POST applications of quizalofop-P, fluazifop-P, clethodim, and sethoxydim at costs of $9.88, 19.76, 29.64, and 39.52/ha for each graminicide. Cost of the manufacturer's suggested use rate for these graminicides was approximately $29.64/ha, which corresponded to 0.09, 0.22, 0.14, and 0.27 kg ai/ha for these respective graminicides. When applied at a cost of $9.88/ha, quizalofop-P controlled rhizomatous johnsongrass more effectively than the other graminicides in five of 11 experiments. Quizalofop-P and fluazifop-P controlled johnsongrass similarly when applied at higher costs per hectare in 10 of 11 experiments. Sethoxydim was less effective than quizalofop-P or fluazifop-P in most instances, especially when graminicides were applied at costs of $9.88 or $19.76/ha. Clethodim was generally more effective than sethoxydim. Fluazifop-P and clethodim controlled rhizomatous johnsongrass similarly in six of 11 experiments regardless of cost. Differences in rhizomatous johnsongrass control among graminicides did not always translate into differences in soybean yield, although graminicides increased yield over the nontreated control in most experiments regardless of the graminicide cost. In several experiments, soybean treated with clethodim or sethoxydim applied at a cost of $9.88/ha yielded lower than when applied at higher costs.

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 acidquizalofop-P, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy] propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onejohnsongrass, Sorghum halepense L. Pers. # SORHAEconomicsherbicide costreduced herbicide ratesweed managementclethodimfluazaifop-Pquizalofop-Psethoxydim
Type
Research
Information
Weed Technology , Volume 11 , Issue 4 , December 1997 , pp. 804 - 809
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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