Non-2,4-D-resistant cotton response to glyphosate plus 2,4-D choline tank contamination

Misha R. Manuchehri, Peter A. Dotray, J. Wayne Keeling, Gaylon D. Morgan, Seth A. Byrd

Research output: Contribution to journalArticlepeer-review

Abstract

Field trials were conducted near Lubbock, TX, in 2013, 2014, and 2015 to evaluate non-2,4-D-resistant cotton response to low rates of glyphosate plus 2,4-D choline. Cotton was treated with five rates of glyphosate plus 2,4-D choline (0.0183, 0.183, 1.83, 18.3, and 183 g ae ha-1) at two application timings (nine leaf and first bloom). These rates correspond to contamination rates of 0.0008%, 0.008%, 0.08%, 0.8%, and 8%, respectively. Visual cotton injury, boll retention, lint yield, and fiber properties were recorded. When averaged over contamination rates, visual injury after applications made to nine-leaf cotton was greater than for first-bloom cotton in three of 3 yr and yield loss was greater when applications were made to nine-leaf cotton when compared with first-bloom cotton in two of 3 yr. Averaged over application timing, lint yield in 2013, 2014, and 2015 after glyphosate plus 2,4-D choline contamination rates of 0.0008% and 0.008% were not different than that of the nontreated control, whereas contamination rates of 0.08%, 0.8%, and 8% decreased yield by 3% to 20%, 45% to 58%, and 80% to 96%, respectively. Contamination rates of 0.0008%, 0.008%, 0.08%, and 0.8% rarely affected fiber quality; however, a contamination rate of 8% frequently decreased micronaire, fiber length, fiber length uniformity, and fiber strength. This decrease in fiber quality also resulted in a reduction in cotton loan value and potential financial return. Although decreases in fiber quality parameters were not observed with the 0.8% contamination rate, significant reductions in financial return occurred due to yield loss caused by injury from glyphosate plus 2,4-D choline.

Original languageEnglish
Pages (from-to)82-88
Number of pages7
JournalWeed Technology
Volume34
Issue number1
DOIs
StatePublished - 2020

Keywords

  • Off-target movement
  • fiber quality
  • simulated drift
  • synthetic auxin
  • yield

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