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Weed Management in Cotton with CGA-362622, Fluometuron, and Pyrithiobac

Published online by Cambridge University Press:  20 January 2017

Ian C. Burke  and
John W. Wilcut
Ian C. Burke
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
John W. Wilcut*
Affiliation:
Box 7620, 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

An experiment was conducted at five locations in North Carolina during 2000 and 2001 to evaluate weed control, crop injury, and cotton yield. Weed management systems included different combinations of pyrithiobac preemergence (PRE), fluometuron PRE, CGA-362622 postemergence (POST), pyrithiobac POST, and monosodium salt of methylarsonic acid (MSMA) plus prometryn applied late POST-directed (LAYBY). At Goldsboro in 2000, cotton was injured 74 to 78% by CGA-362622 POST when evaluated 4 to 7 d after treatment (DAT). Injury at Clayton, Goldsboro, and Lewiston in 2001 and Rocky Mount in 2000 was less than 16% 4 to 7 DAT with the same treatment and was not apparent by 62 DAT. CGA-362622 controlled common lambsquarters, common ragweed, Palmer amaranth, sicklepod, smooth pigweed, and Ipomoea species including entireleaf, ivyleaf, and pitted morningglory, and the addition of pyrithiobac to the herbicide system, either PRE or POST, increased control of Amaranthus species, jimsonweed, and prickly sida. CGA-362622 did not control jimsonweed or prickly sida. Fluometuron PRE, pyrithiobac PRE, and MSMA plus prometryn LAYBY were beneficial for increasing weed control and cotton lint yields. Prometryn plus MSMA LAYBY increased control of common ragweed, entireleaf morningglory, jimsonweed, pitted morningglory, and smooth pigweed and provided higher cotton yields than similar systems without a LAYBY. The greatest weed control and greatest cotton lint yields required complete weed management systems that included a combination of PRE, POST, and LAYBY treatments.

Keywords

fluometuronmonosodium salt of methylarsonic acidprometrynpyrithiobaccommon lambsquarters, Chenopodium album L. # CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHEjimsonweed, Datura stramonium L. # DATSTPalmer amaranth, Amaranthus palmerii L. # AMAPApitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPsicklepod, Senna obtusifolia (L.) Irwin and Barneby # CASOBsmooth pigweed, Amaranthus hybridus L. # AMACHCrop injurycrop yieldDAT, days after treatmentEPOST, early postemergencefb, followed byLAYBY, late postemergence directedMSMA, monosodium salt of methylarsonic acidPOST, postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 268 - 276
Copyright
Copyright © Weed Science Society of America 

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