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Responses of Selected Weeds and Glyphosate-Resistant Cotton and Soybean to Two Glyphosate Salts

Published online by Cambridge University Press:  20 January 2017

Robert J. Richardson ,
William A. Bailey ,
Gregory R. Armel ,
Cory M. Whaley ,
Henry P. Wilson  and
Thomas E. Hines
Robert J. Richardson
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
William A. Bailey
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Gregory R. Armel
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Cory M. Whaley
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Henry P. Wilson*
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Thomas E. Hines
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
*
Corresponding author's E-mail: hwilson@vt.edu
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Abstract

Studies were conducted in 2000 and 2001 to investigate responses of glyphosate-resistant cotton, glyphosate-resistant soybean, and selected weed species to postemergence applications of isopropylamine (Ipa) and diammonium (Dia) salts of glyphosate at selected rates ranging from 0.42 to 3.36 kg ae/ha. No differences were detected between either glyphosate salts or application timings for cotton injury, cotton lint yield, micronaire, fiber length, fiber strength, or fiber uniformity. In a weed-free soybean study, no differences in soybean injury occurred between early-postemergence treatments of the two glyphosate salts. Injury from late-postemergence treatments did not exceed 12% with glyphosate-Ipa or 9% with glyphosate-Dia at 3.36 kg/ha. Soybean treated with glyphosate-Ipa yielded 3,050 kg/ha, whereas soybean treated with glyphosate-Dia yielded 2,880 kg/ha, when averaged over glyphosate rate and application timing. In a soybean study that included weed control as a variable, weed control at 14 d after treatment (DAT), and soybean yield was independent of glyphosate salt. Control of common ragweed, ivyleaf morningglory, pitted morningglory, and large crabgrass at 28 DAT was similar at 0.84 kg/ha of either glyphosate salt.

Keywords

Glyphosatecommon ragweed, Ambrosia artemisiifolia L. # AMBELivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHElarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSApitted morningglory, Ipomoea lacunosa L. # IPOLAcotton, Gossypium hirsutum L. ‘PM1218 BG/RR’soybean, Glycine max (L.) Merr. ‘Asgrow 5401RR’Diammoniumglyphosate formulationglyphosate saltisopropylamineDAT, days after treatmentDia, diammoniumEPOST, early postemergenceIpa, isopropylamineLPOST, late postemergencePOST, postemergencePRE, preemergenceTms, trimethylsulfonium
Type
Research
Information
Weed Technology , Volume 17 , Issue 3 , September 2003 , pp. 560 - 564
Copyright
Copyright © Weed Science Society of America 

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