Summer Annual Weed Control with 2,4-D and Glyphosate
2012
Robinson, Andrew P. | Simpson, David M. | Johnson, William G.
The introduction of 2,4-D-resistant crops stacked with glyphosate resistance will enable the use of 2,4-D and glyphosate for weed control in corn, cotton, and soybean. Because there is little reported on the effectiveness of 2,4-D plus glyphosate on summer annual weed control, the objective was to evaluate 2,4-D and glyphosate tank mixtures on summer annual weed control. Six rates of 2,4-D (0, 280, 420, 560, 840, and 1,120 g ae ha⁻¹) and three rates of glyphosate (0, 840, and 1,120 g ae ha⁻¹) were applied to common lambsquarters, common waterhemp, giant ragweed, giant foxtail, and velvetleaf. Glyphosate at 840 g ha⁻¹ controlled all weeds 94 to 100%. Giant ragweed was controlled 99 to 100% by 2,4-D alone when rates were 280 g ha⁻¹ or higher. Common lambsquarters, common waterhemp, and velvetleaf control increased as 2,4-D rates increased, with 1,120 g ha⁻¹ providing 90 to 94% control.Nomenclature: Glyphosate; 2,4-D; common lambsquarters, Chenopodium album L. CHEAL; common waterhemp, Amaranthus rudis Sauer AMATA; giant ragweed, Ambrosia trifida L. AMBTR; giant foxtail, Setaria faberi Herrm SETFA; velvetleaf, Abutilon theophrasti Medik. ABUTH; corn, Zea mays L.; cotton, Gossypium hirsutum L.; soybean, Glycine Max (L.) Merr.
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