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Response of nonglyphosate-resistant cotton to reduced rates of glyphosate

Published online by Cambridge University Press:  20 January 2017

Donnie K. Miller ,
Robert G. Downer ,
B. Roger Leonard ,
E. Merritt Holman  and
Steve T. Kelly
Robert G. Downer
Affiliation:
Department of Experimental Statistics, LSU AgCenter, Baton Rouge, LA 70803
B. Roger Leonard
Affiliation:
Macon Ridge Location of Northeast Research Station, LSU AgCenter, Winnsboro, LA 71295
E. Merritt Holman
Affiliation:
LSU Northeast Research Station, LSU AgCenter, St. Joseph, LA 71366
Steve T. Kelly
Affiliation:
Scott Research and Extension Center, LSU AgCenter, Winnsboro, LA 71295
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Abstract

Field research was conducted in 1999 and 2000 to determine the effect of reduced glyphosate rates on growth and yield of nonglyphosate-resistant cotton. Rates of 9, 18, 35, 70, 140, and 280 g ha−1, representing 0.008, 0.016, 0.031 0.063, 0.125, and 0.25, respectively, of the maximum use rate per application (1,120 g ha−1), were applied to cotton at the two-, five-, or nine-node growth stage. On the basis of visual injury estimates, cotton was more tolerant to glyphosate at the nine-node than at earlier growth stages. Plant dry weight was reduced with 70 g ha−1 of glyphosate or higher, when applied at the two- and five-node growth stages in two of three experiments. Dry weight was not affected by glyphosate at the nine-node stage. Plant height also was unaffected by glyphosate rates below 70 g ha−1, but height reduction was noted for all growth stages by experiment combinations, with the exception of the nine-node application for both experiments in 2000, with herbicide rates of 70 g ha−1 or higher. Cotton maturity delay, as noted by an increase in node above white flower number, was observed only at the highest glyphosate rate applied to two- and five-node cotton in one of three experiments. Percent open boll data analysis indicated a decreased opportunity of observing an open boll with increasing glyphosate rate, and this effect was greater at the five-node compared with the two- and nine-node stages in two of three experiments. Seedcotton yield after all glyphosate applications was equivalent to that for the nontreated control.

Keywords

Glyphosatecotton, Gossypium hirsutum L. ‘Stoneville 474’, ‘DP33B’Crop injurynontarget applicationdrift
Type
Special Topics
Information
Weed Science , Volume 52 , Issue 1 , February 2004 , pp. 178 - 182
Copyright
Copyright © Weed Science Society of America 

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