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Economic assessment of weed management for transgenic and nontransgenic cotton in tilled and nontilled systems

Published online by Cambridge University Press:  20 January 2017

Shawn D. Askew ,
William A. Bailey ,
George H. Scott  and
John W. Wilcut
Shawn D. Askew
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
William A. Bailey
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
George H. Scott
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
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Abstract

Studies were conducted to evaluate weed management programs in nontransgenic, bromoxynil-resistant, and glyphosate-resistant cotton in nontilled and tilled environments. Tillage did not affect weed control provided by herbicides. Early-season stunting in nontilled cotton was 3% regardless of the herbicide system and was no longer evident at midseason. Cotton yield was 10 to 15% greater, on an average, under tilled conditions than that under nontilled conditions. Excellent (> 90%) common lambsquarters, entireleaf morningglory, ivyleaf morningglory, jimsonweed, pitted morningglory, prickly sida, tall morningglory, and velvetleaf control was achieved with treatments containing pyrithiobac, bromoxynil, and glyphosate. Preemergence (PRE) or postemergence-directed (PD) herbicide inputs were necessary for adequate large crabgrass and goosegrass control. Bromoxynil and pyrithiobac postemergence did not control sicklepod unless supplemented with MSMA and followed by a late-postdirected treatment of cyanazine plus MSMA. Treatments that included glyphosate controlled sicklepod regardless of the late-PD treatment. Economic returns were at least $930 ha−1 and not different from the higher yielding programs in nontransgenic cotton when fluometuron applied PRE was included in the bromoxynil programs. Late-season weed control was usually greater than 90% from glyphosate programs, and net returns from glyphosate programs were as high or higher than the net returns from programs that used midseason treatments of bromoxynil, pyrithiobac, or fluometuron plus MSMA.

Keywords

BromoxynilcyanazinefluometuronglyphosateMSMApendimethalinpyrithiobaccommon lambsquarters, Chenopodium album L. CHEALentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray IPOHGgoosegrass, Eleusine indica (L.) Gaertn. ELEINivyleaf morningglory, Ipomoea hederacea (L.) Jacq. IPOHEjimsonweed, Datura stramonium L. DATSTlarge crabgrass, Digitaria sanguinalis (L.) Scop. DIGSApitted morningglory, Ipomoea lacunosa L. IPOLAprickly sida, Sida spinosa L. SIDSPsicklepod, Senna obtusifolia (L.) Irwin and Barnaby CASOBsmooth pigweed, Amaranthus hybridus L. AMACHtall morningglory, Ipomoea purpurea L. PHBPUvelvetleaf, Abutilon theophrasti Medicus ABUTHcotton, Gossypium hirsutum L. ‘Paymaster 1330RR’, ‘Stoneville BXN47’, ‘Stoneville 474’Economic analysisherbicide-resistant cropstillage
Type
Research Article
Information
Weed Science , Volume 50 , Issue 4 , August 2002 , pp. 512 - 520
Copyright
Copyright © Weed Science Society of America 

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