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Glyphosate Systems for Weed Control in Glyphosate-Tolerant Cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  20 January 2017

George H. Scott ,
Shawn D. Askew  and
John W. Wilcut
George H. Scott
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Shawn D. Askew
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
John W. Wilcut*
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: john_wilcut@ncsu.edu.
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Abstract

Field studies were conducted at three locations in North Carolina to evaluate clomazone preemergence (PRE) in glyphosate-tolerant cotton. Cotton was injured by fluometuron PRE at one location. Clomazone PRE controlled common ragweed, goosegrass, large crabgrass, and prickly sida better than trifluralin preplant incorporated (PPI). Trifluralin controlled Palmer amaranth better than clomazone. The addition of a late post-directed (LAYBY) treatment of cyanazine plus MSMA improved the control of goosegrass. Glyphosate at 0.8 kg ai/ha, used postemergence as needed, controlled tall morningglory and entireleaf morningglory at least 84%. Common ragweed was controlled with all herbicides, except trifluralin PPI. Prickly sida was controlled 94% or greater in glyphosate-containing systems. Cotton yields and net returns were similar for all glyphosate systems, regardless of soil-applied herbicides and LAYBY treatment options.

Keywords

ClomazonecyanazinefluometuronglyphosateMSMAtrifluralincommon ragweed, Ambrosia artemisiifolia L. #3 AMBELentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray # IPOHGgoosegrass, Eleusine indica (L.) Gaertn. # ELEINlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAPalmer amaranth, Amaranthus palmeri S.Wats # AMAPAprickly sida, Sida spinosa L. # SIDSPtall morningglory, Ipomoea purpurea (L.) Roth # PHBPUcotton, Gossypium hirsutum L. ‘Paymaster 1330RR’, ‘DP5415RR’Economic analysis, herbicide-resistant cropsANS, as needed sprayDAP, days after plantingEPOST, early postemergencefb, followed byLAYBY, late post directedPOST, postemergencePOT, postemergence over-the-topPPI, preplant incorporatedPRE, preemergence
Type
Research
Information
Weed Technology , Volume 16 , Issue 1 , March 2002 , pp. 191 - 198
Copyright
Copyright © Weed Science Society of America 

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