Weed Management in Corn with Postemergence Applications of Tembotrione or Thiencarbazone : Tembotrione
2015
Stephenson, Daniel O. | Bond, Jason A. | Landry, Randall L. | Edwards, H Matthew
Four field experiments were conducted in Louisiana and Mississippi in 2009 and 2010 to evaluate POST herbicides treatments with tembotrione applied alone or as a prepackaged mixture with thiencarbazone for weed control in corn. Treatments included tembotrione at 92 g ai ha⁻¹, thiencarbazone : tembotrione at 15 : 76 g ai ha⁻¹, atrazine at 2,240 g ai ha⁻¹, glufosinate at 450 g ai ha⁻¹, glyphosate at 860 g ae ha⁻¹, and coapplications of tembotrione or thiencarbazone : tembotrione with atrazine, glufosinate, or glyphosate. All treatments were applied to 26-cm corn in the V4 growth stage. Treatments containing thiencarbazone : tembotrione and those with tembotrione controlled barnyardgrass, browntop millet, entireleaf morningglory, hophornbeam copperleaf, johnsongrass, Palmer amaranth, and velvetleaf 85 to 96% and 43 to 97% 28 d after treatment and at corn harvest, respectively. Corn yield ranged from 9,200 to 10,420 kg ha⁻¹ and was greater than the nontreated control following all herbicide treatments, except atrazine alone. Results indicated that thiencarbazone : tembotrione or tembotrione POST is an option for weed management in corn, and applications of thiencarbazone : tembotrione would be strongly encouraged where rhizomatous johnsongrass is problematic.Nomenclature: Atrazine; glufosinate; glyphosate; tembotrione; thiencarbazone; barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCG; browntop millet, Urochloa ramosa (L.) Nguyen PANRA; entireleaf morningglory, Ipomoea hederacea var. integriuscula Gray IPOHG; hophornbeam copperleaf, Acalypha ostryifolia Riddell ACCOS; johnsongrass, Sorghum halepense (L.) Pers. SORHA; Palmer amaranth, Amaranthus palmeri S. Wats AMAPA; velvetleaf, Abutilon theophrasti Medik ABUTH; corn, Zea mays L. ZEAMX.
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