Document Type
Article
Publication Date
2021
Keywords
Weed-control; Resistant Corn; Management; Glyphosate; Combinations; Efficacy; Palmeri; Rudis
Abstract
Atrazine is a foundational herbicide in corn (Zea mays L.) because of its broad-spectrum weed control and utility for pre-emergence or postemergence applications. Extensive atrazine use has led to traces in groundwater, surface water, and aquifers. This research explored corn herbicide regimes with little or no atrazine. Pre-emergence herbicide treatments [S-metolachlor (0.955 lb acre–1); saflufenacil (0.054 oz acre–1) plus dimethenamid-P (0.473 lb acre–1)] and postemergence herbicide mixtures [bicyclopyrone (0.040 lb acre–1) plus mesotrione (0.161 lb acre–1) plus S-metolachlor (1.429 lb acre–1); thiencarbazone-methyl (0.013 lb acre–1) plus tembotrione (0.067 lb acre–1), thiencarbazone-methyl (0.033 lb acre–1) plus isoxaflutole (0.082 lb acre–1); acetochlor (0.964 lb acre–1) plus mesotrione (0.103 lb acre–1) plus clopyralid (0.065 lb acre–1)] were applied alone or combined with atrazine at 0.50 lb acre–1 to glyphosate- or glufosinate-resistant corn. All postemergence applications contained glyphosate (1.125 lb acre–1) plus glufosinate (0.402 lb acre–1). Palmer amaranth [Amaranthus palmeri (S.) Watson], broadleaf signalgrass [Urochloa platyphylla (Munro ex C. Wright) Nash], and pitted morningglory (Ipomoea lacunosa L.) control were always greater than 95%. Saflufenacil plus dimethenamid-P injured corn 8 and 5% more than S-metolachlor 21 d after pre-emergence application. Averaged over pre-emergence herbicide and atrazine rate, thiencarbazone-methyl plus isoxaflutole injured corn by 21% in 2017. The addition of atrazine did not improve corn yield in 7 of 16 instances. According to this research, the weeds assessed at these densities can be controlled without atrazine by some programs.
Citation
Norsworthy, J. K., Richburg, J. T., Barber, L. T., Roberts, T., & Gbur, E. (2021). Evaluation of Corn Herbicide Programs With and Without Atrazine. Crop, Forage & Turfgrass Management, 7 (2), e20128. https://doi.org/10.1002/cft2.20128
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This work is licensed under a Creative Commons Attribution 4.0 International License.
