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Effect of Glyphosate and MSMA Application Timing on Weed Control, Fruiting Patterns, and Yield in Glyphosate-Resistant Cotton

Published online by Cambridge University Press:  20 January 2017

Michael W. Edenfield ,
Barry J. Brecke ,
Daniel L. Colvin ,
Joan A. Dusky  and
Donn G. Shilling
Michael W. Edenfield*
Affiliation:
Agronomy Department, University of Florida, P.O. Box 110500, Gainesville, FL 32611
Barry J. Brecke
Affiliation:
Agronomy Department, University of Florida, P.O. Box 110500, Gainesville, FL 32611
Daniel L. Colvin
Affiliation:
Plant Science and Education Unit, University of Florida, Gainesville, FL 32611
Joan A. Dusky
Affiliation:
University of Florida, Gainesville, FL 32611
Donn G. Shilling
Affiliation:
Agronomy Department, University of Florida, P.O. Box 110500, Gainesville, FL 32611
*
Corresponding author's E-mail: [email protected]
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Abstract

The limited window of opportunity for glyphosate postemergence (POST) over-the-top applications in glyphosate-resistant cotton poses a problem for growers where a midseason salvage weed control remedy is necessary. The objectives of these experiments were to compare glyphosate and MSMA for midseason weed control and their subsequent effect on cotton fruiting characteristics and yield. Glyphosate at 0.85 kg ai/ha was more effective than MSMA at 1.7 kg ai/ha for POST control of sicklepod, redweed, and pitted morningglory. Single glyphosate treatments applied at the 8-, 10-, or 12-leaf cotton stage resulted in less-effective weed control than when applied at the four-leaf cotton stage. Glyphosate applied at the four-leaf cotton stage followed by a sequential POST-directed application at 6-, 8-, 10-, or 12-leaf cotton stage increased season-long weed control and yield compared with a single application at the four-leaf stage. Both glyphosate and MSMA controlled Florida beggarweed, regardless of POST application timing. Generally, cotton was more tolerant to glyphosate than MSMA when applied over-the-top. Glyphosate applied POST over-the-top to weed-free 12-leaf cotton resulted in a 19 and 14% yield loss compared with the weed-free nontreated cotton in 1997 and 1999. MSMA reduced yield by 58 and 36% in 1997 and 1999, respectively. Glyphosate did not affect weed-free cotton fruit development or yield when applied over-the-top to four-leaf cotton or when a POST-directed application was followed at the 12-leaf stage.

Keywords

GlyphosateMSMAFlorida beggarweed, Desmodium tortuosum (Sw.) DC. # DEDTOpitted morningglory, Ipomoea lacunosa L. # IPOLAredweed, Melochia corchorifolia L. # MEOCOsicklepod, Senna obtusifolia L. # SENOBcotton, Gossypium hirsutum L.Application timingcotton boll retentionsalvage weed controlPOST, postemergencePOST-directed, postemergence-directedPPI, preplant incorporatedPRE, preemergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 224 - 230
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Bayer CropScience, 17745 South Metcalf, Building #1, Stilwell, KS 66085-9104.

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