Efficacy of Selected Herbicide Programs in 2,4-D Tolerant Cotton (Gossypium hirsutum L.) ()
ABSTRACT
The use of transgenic crops has grown significantly over the past couple of
decades. Many agronomic crops produced today are tolerant to glyphosate.
Glyphosate-tolerant crops were commercially introduced in 1996, and, about
nine years later, glyphosate-resistant Palmer amaranth was confirmed in
Georgia. Glyphosate-resistant weeds arose from reliance on postemergence
only glyphosate programs to control weeds in crops. New transgenic traits for
glufosinate and 2,4-D choline have been developed, and evaluations of stacked
traits and concurrent use of multiple herbicides have provided additional
tools in the management of glyphosate-resistant weeds. Field experiments
were conducted in 2012 and 2013 at the Edisto Research and Education Center
near Blackville, SC, USA to determine the efficacy of 2,4-D-based herbicide
programs in transgenic cotton tolerant to 2,4-D choline, glyphosate, and
glufosinate. The treatments provided good to excellent Palmer amaranth and
pitted morningglory control in 2012 and 2013. Seed cotton yields across
treatments ranged from 0 to 2057 kg ha-1. This new trait technology package
in cotton permits in-season postemergence use of 2,4-D choline, a herbicide
mode of action not previously used postemergence in cotton, which can control
resistant weeds, including Palmer amaranth if applied at the proper
growth stage.
Share and Cite:
Sanders, C. , Joseph, D. and Marshall, M. (2017) Efficacy of Selected Herbicide Programs in 2,4-D Tolerant Cotton (
Gossypium hirsutum L.).
Agricultural Sciences,
8, 1157-1167. doi:
10.4236/as.2017.810084.