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1 January 2005 Yield and Physiological Response of Nontransgenic Cotton to Simulated Glyphosate Drift
WALTER E. THOMAS, IAN C. BURKE, BRIDGET L. ROBINSON, WENDY A. PLINE-SRNIĆ, KEITH L. EDMISTEN, RANDY WELLS, JOHN W. WILCUT
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Abstract

Field studies were conducted in 2001 in Lewiston, NC, and in 2002 at Clayton and Lewiston, NC, to investigate the response of nontransgenic cotton to simulated glyphosate drift in a weed-free environment. Nontransgenic cotton variety ‘Fibermax 989’ was planted in a conventional seedbed at all locations. Glyphosate treatments were applied early postemergence (EPOST) at the four-leaf growth stage of cotton at 0, 8.7, 17.5, 35, 70, 140, 280, 560, and 1,120 g ai/ha and represent 0, 0.78, 1.55, 3.13, 6.25, 12.5, 25, 50, and 100% of the commercial use rate, respectively. Rates as low as 140 g/ha caused lint yield reductions depending on year and location. When averaged over all locations, lint yield reductions of 4, 49, 72, and 87% compared with nontreated cotton were observed with glyphosate rates of 140, 280, 560, and 1,120 g/ha, respectively. Visual injury and shikimic acid accumulation were evident at glyphosate rates greater or equal to 70 g/ha. Collectively, visual injury and shikimic acid accumulation at 7 d after EPOST treatment might be used as a diagnostic indicator to predict potential yield reductions from simulated glyphosate drift.

Nomenclature: Glyphosate; cotton, Gossypium hirsutum L. ‘Fibermax 989’.

Additional index words: Shikimic acid.

Abbreviations: DAT, days after early postemergence treatment; DD, degree-day; EPOST, early postemergence; EPSPS, 5-enolpyruvylshikimate-3-phosphate synthase [EC 2.5.1.19]; HPLC, high-performance liquid chromatography; PDS, postemergence-directed; POST, postemergence; PRE, preemergence.

WALTER E. THOMAS, IAN C. BURKE, BRIDGET L. ROBINSON, WENDY A. PLINE-SRNIĆ, KEITH L. EDMISTEN, RANDY WELLS, and JOHN W. WILCUT "Yield and Physiological Response of Nontransgenic Cotton to Simulated Glyphosate Drift," Weed Technology 19(1), 35-42, (1 January 2005). https://doi.org/10.1614/WT-03-194R
Published: 1 January 2005
JOURNAL ARTICLE
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