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Response of Glyphosate-Resistant Soybean (Glycine max) to Trimethylsulfonium and Isopropylamine Salts of Glyphosate

Published online by Cambridge University Press:  20 January 2017

Ronald F. Krausz  and
Bryan G. Young
Ronald F. Krausz*
Affiliation:
Department of Plant, Soil, and General Agriculture, Center for Excellence in Soybean Research, Teaching, and Outreach, Southern Illinois University, Carbondale, IL 62901
Bryan G. Young
Affiliation:
Department of Plant, Soil, and General Agriculture, Center for Excellence in Soybean Research, Teaching, and Outreach, Southern Illinois University, Carbondale, IL 62901
*
Corresponding author's E-mail: rkrausz@siu.edu.
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Abstract

Field studies were conducted from 1998 to 2000 to evaluate the effects of the trimethylsulfonium (Tms) salt of glyphosate on glyphosate-resistant soybean at Belleville, IL. Glyphosate-Tms and glyphosate-isopropylamine (Ipa) at 1,120, 1,680, 2,240, 3,360, and 4,480 g ai/ha were applied at the V4 and R1 growth stages of glyphosate-resistant soybean. Glyphosate-Tms and glyphosate-Ipa caused greater chlorosis when applied at the R1 growth stage when compared with the V4 growth stage, and chlorosis increased with rate. Chlorosis ranged from 0 to 20% depending on the year. In 1998, glyphosate-Ipa at 2,240 and 3,360 g/ha applied at the R1 growth stage caused 4 to 5% more chlorosis than glyphosate-Tms at the same rates. In addition to chlorosis, glyphosate-Tms caused bleaching (white speckling) of soybean leaves, with bleaching increasing as glyphosate-Tms rate increased. Glyphosate-Ipa caused no bleaching, regardless of rate. Glyphosate-Tms and -Ipa caused no visible height reduction at 14 and 28 d after treatment in any year. In 1998 and 1999, glyphosate-Tms and -Ipa, at the highest rate applied at the R1 growth stage, increased days to maturity of soybean. Despite the injury and delay in maturity caused by glyphosate-Tms and -Ipa, there was no difference in grain yield across years because of glyphosate salt, rate, or application timing.

Keywords

Glyphosatesoybean, Glycine max (L.) Merr. ‘Pioneer 94B01 RR’Herbicide injury, postemergence, transgenic soybeanDAT, days after treatmentEPSPS, 5-enolpyruvylshikimate-3-phosphate synthaseIpa, isopropylamineTms, trimethylsulfonium
Type
Research
Information
Weed Technology , Volume 15 , Issue 4 , December 2001 , pp. 745 - 749
Copyright
Copyright © Weed Science Society of America 

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