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Effectiveness of Preemergence Herbicide and Postemergence Glyphosate Programs in Second-Generation Glyphosate-Resistant Cotton

Published online by Cambridge University Press:  20 January 2017

Derek M. Scroggs,
Donnie K. Miller,
James L. Griffin,
John W. Wilcut,
David C. Blouin,
Alexander M. Stewart and
P. Roy Vidrine
Derek M. Scroggs*
Affiliation:
Dean Lee Research Station, Louisiana State University AgCenter, 8105 Tom Bowman Dr., Alexandria, LA 71302
Donnie K. Miller
Affiliation:
Northeast Research Station, Louisiana State University AgCenter, P.O. Box 438, St. Joseph, LA 71366
James L. Griffin
Affiliation:
School of Plant, Environmental and Soil Sciences, 104 Sturgis Hall, Louisiana State University, Baton Rouge, LA 70803
John W. Wilcut
Affiliation:
Crop Science Department, Campus Box 7620, North Carolina State University, Raleigh, NC 27694-7620
David C. Blouin
Affiliation:
Department of Experimental Statistics, LSU AgCenter, 161 Ag. Admin. Bldg., Baton Rouge, LA 70803
Alexander M. Stewart
Affiliation:
Dean Lee Research Station, Louisiana State University AgCenter, 8105 Tom Bowman Dr., Alexandria, LA 71302
P. Roy Vidrine
Affiliation:
Dean Lee Research Station, Louisiana State University AgCenter, 8105 Tom Bowman Dr., Alexandria, LA 71302
*
Corresponding author's E-mail: dscroggs@agctr.lsu.edu
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Abstract

A study was conducted in 2004 and 2005 to evaluate the benefit of applying fluometuron PRE versus glyphosate-only POST programs in second-generation GR cotton (Roundup Ready Flex®). Fluometuron was either included or excluded with POST application timings of glyphosate at the following cotton growth stages: (1) 3 leaf (lf) followed by (fb) 7 lf fb 14 lf (over the top) OT (2) 3 fb 7 lf OT (3) 7 lf OT fb 14 lf postemergence directed (PD), and (4) 7 fb 14 lf OT. Control of goosegrass, Palmer amaranth, pitted morningglory, sicklepod, and smellmelon was increased 2 to 8 percentage points with the addition of fluometuron PRE. The inclusion of fluometuron PRE did not improve control of barnyardgrass, browntop millet, hemp sesbania, johnsongrass, or redroot pigweed and control ranged from 81% to 84%, 69% to 75%, 94% to 94%, 87% to 89%, and 92% to 93%, respectively. By 56 d after the last POST application, control of johnsongrass, Palmer amaranth, pitted morningglory, and smellmelon was at least 83%, 93%, 92%, and 86%, respectively, with only slight differences noted among POST glyphosate programs. Control of barnyardgrass, browntop millet, and redroot pigweed was 68%, 47%, 86%, respectively, with the POST glyphosate program of 3 fb 7 lf OT, which was significantly less than all other glyphosate POST programs. Cotton yield increased 32% and 36% with the addition of fluometuron PRE to glyphosate POST programs consisting of 7 lf OT fb 14 lf PD and 7 lf fb 14 lf OT, respectively. Cotton yield for other glyphosate POST programs including an earlier 3 lf application was not improved when fluometuron was applied PRE. Without inclusion of fluometuron PRE, yield was maximized with the glyphosate POST program that included three applications of glyphosate (2,510 kg/ha). Overall, this research emphasizes the fact that weed control is important in the early season as well as in the late season in second-generation GR cotton.

Keywords

FluometuronglyphosatebarnyardgrassEchinochloa crus-galli (L.) Beauv. ECHCGbrowntop millet, Urochloa ramosa (L.) Nguyen PANRAgoosegrass, Eleusine indica (L.) Gaertn. ELEINhemp sesbania, Sesbania herbacea (P. Mill.) McVaugh SEBEXjohnsongrass, Sorghum halepense (L.) Pers. SORHAPalmer amaranth, Amaranthus palmeri S. Wats. AMAPApitted morningglory, Ipomoea lacunosa L. IPOLAredroot pigweed, Amaranthus retroflexus L. AMAREsicklepod, Senna obtusifolia (L.) Irwin and Barneby CASOBsmellmelon, Cucumis melo L. CUMMDcotton, Gossypium hirsutum L.Herbicide-tolerant cottonresidual weed control

Information

Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007, pp. 877 - 881
Copyright
Copyright © Weed Science Society of America 

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