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.
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