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Weed Management in Glyphosate-Resistant Corn with Glyphosate and Halosulfuron

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

Three field studies were conducted at Lewiston Woodville, NC, in 2001 and 2002 to evaluate crop tolerance, weed control, grain yield, and net returns in glyphosate-resistant corn with various herbicide systems. Crop injury, weed control, and grain yield were not influenced by glyphosate formulation. Atrazine preemergence (PRE) and atrazine plus metolachlor PRE, averaged over postemergence (POST) systems, controlled Texas panicum at least 80 and 87%, respectively. Sequential glyphosate applications (early postemergence [EPOST] followed by [fb] POST) provided at least 99% control of Texas panicum compared with at least 86 and 88% control with glyphosate EPOST and glyphosate plus halosulfuron EPOST, respectively. Atrazine plus metolachlor PRE fb any glyphosate system controlled large crabgrass and goosegrass 89 to 100% and 94 to 100%, respectively. Sequential glyphosate treatments controlled large crabgrass and goosegrass at least 99 and 95%, respectively. Regardless of PRE system, glyphosate plus halosulfuron EPOST and sequential applications of glyphosate controlled common ragweed and common lambsquarters at least 99%, whereas glyphosate EPOST alone provided at least 88 and 96% control, respectively. Glyphosate plus halosulfuron EPOST and glyphosate sequentially controlled yellow nutsedge similarly and more consistently than glyphosate EPOST. Regardless of PRE treatment, sequential glyphosate applications provided at least 98% control of entireleaf and pitted morningglory, whereas glyphosate EPOST controlled at least 64 and 62%, respectively. Glyphosate EPOST and the sequential glyphosate EPOST fb POST systems yielded similarly at all three locations. Net returns were highest at all three locations with the glyphosate sequential system, with similar net returns obtained with glyphosate EPOST and glyphosate plus halosulfuron EPOST at two and one locations, respectively.

Keywords

Atrazineglyphosatehalosulfuronmetolachlorcommon lambsquarters, Chenopodium album L. #3 CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELentireleaf morningglory, Ipomoea hederacea var. integruiscula Gray # IPOHGgoosegrass, Eleusine indica (L.) Gaertn. # ELEINlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSApitted morningglory, Ipomoea lacunosa L. # IPOLATexas panicum, Panicum texanum Buckl. # PANTEyellow nutsedge, Cyperus esculentus L. # CYPEScorn, Zea mays L. # ZEAMXDiammonium saltisopropylamine saltnet returnsDAT, days after treatmentEPOST, early postemergencefb, followed byPOST, postemergencePRE, preemergence.
Type
Research
Information
Weed Technology , Volume 18 , Issue 4 , December 2004 , pp. 1049 - 1057
Copyright
Copyright © Weed Science Society of America 

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