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Weed Management in Glyphosate-Resistant Corn with Glyphosate, Halosulfuron, and Mesotrione

Published online by Cambridge University Press:  20 January 2017

Walter E. Thomas ,
Ian C. Burke  and
John W. Wilcut
Walter E. Thomas
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Ian C. Burke
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
John W. Wilcut*
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: john_wilcut@ncsu.edu
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Abstract

Four field studies were conducted at the Peanut Belt Research Station near Lewiston Woodville, NC, in 2000, 2001, and 2002 to evaluate crop tolerance, weed control, grain yield, and net returns in glyphosate-resistant corn with various herbicide systems. Preemergence (PRE) treatment options included no herbicide, atrazine at 1.12 kg ai/ha, or atrazine plus metolachlor at 1.68 kg ai/ha. Postemergence (POST) treatment options included glyphosate at 1.12 kg ai/ha as either the isopropylamine salt or the diammonium salt, either alone or in mixtures with mesotrione at 105 g ai/ha plus crop oil concentrate at 1% (v/v) or halosulfuron at 53 g ai/ha plus 0.25% (v/v) nonionic surfactant. All response variables were independent of glyphosate formulation. Addition of metolachlor to atrazine PRE improved large crabgrass and goosegrass control but did not always improve Texas panicum control. POST control of these annual grasses was similar with glyphosate alone or in mixture with halosulfuron or mesotrione. Glyphosate POST controlled common lambsquarters and common ragweed 89 and 93%, respectively. Glyphosate plus halosulfuron POST provided more effective yellow nutsedge control than glyphosate POST. Atrazine PRE or atrazine plus metolachlor PRE followed by any glyphosate POST treatment controlled Ipomoea spp. at least 93%. Glyphosate plus mesotrione in total POST systems always provided greater control of Ipomoea spp. than glyphosate alone. The highest yielding treatments always included glyphosate POST, either with or without a PRE herbicide treatment. Similarly, systems that included any glyphosate POST treatment had the highest net returns.

Keywords

Atrazineglyphosatehalosulfuronmesotrionemetolachlorcommon lambsquarters, Chenopodium album L. # CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELgoosegrass, Eleusine indica (L.) Gaertn. # ELEINlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSATexas panicum, Panicum texanum Buckl. # PANTEyellow nutsedge, Cyperus esculentus L.corn, Zea mays L. # ZEAMXDiammonium saltisopropylamine saltnet returnsALS, acetolactate synthaseDAT, days after early postemergence treatmentfb, followed byGR, glyphosate-resistantPOST, postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 826 - 834
Copyright
Copyright © Weed Science Society of America 

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