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Control of Glyphosate-Resistant Palmer Amaranth in DHT Cotton, and Peanut Response to 2,4-D
 

Summary: Control of Glyphosate-Resistant Palmer Amaranth in
DHT Cotton, and Peanut Response to 2,4-D
Rand M. Merchant
Crop and Soil Sciences Seminar
Wednesday February 23, 2011 at 3:35 PM
Room 2401 Miller Plant Sciences Building
Glyphosate-resistant Palmer amaranth is changing cotton production in the southeastern United
States. This weed was first confirmed in Macon county Georgia in 2004 (Culpepper et al., 2006). A single
Palmer amaranth plant in 1 m of row can cause a 13% yield reduction. If that same 1 m of row is infested
with 10 Palmer amaranth plants, yield can be reduced by 57% (Fast et al., 2009). DHT cotton is a new
technology being developed by Dow AgroSciences that will allow POST broadcast application of 2,4-D
and glufosinate for control of Palmer amaranth. In 2009-2010, trials were conducted to determine the
efficacy of potential tank mixtures in non-crop plots. Glufosinate was applied at 0 and 0.47 kg ai/ha
alone and tank mixed with 2,4-D at 0.56, 0.84, and 1.12 kg ai/ha, or with dicamba at 0.28, 0.56, and 1.12
kg ai/ha. Applications were made using standard agricultural materials and procedures. Results showed
that tank mixtures of glufosinate with 2,4-D or dicamba controlled 89 to 97% of Palmer amaranth plants.
Future research will apply the same procedures to plots that are planted with DHT cotton with yield
results taken at the end of the season. The use of broadcast 2,4-D in fields near to peanuts is a cause of
concern in peanut management. Peanuts are sensitive to 2,4-D and can be damaged by drift and
volatilization. Since peanuts are often grown in close proximity to cotton, damage by 2,4-D is plausible.

  

Source: Arnold, Jonathan - Nanoscale Science and Engineering Center & Department of Genetics, University of Georgia

 

Collections: Biotechnology