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Efficacy of Recovery Sprays to
Auxin Injury on Cotton

December 2019

By James A. Griffin
Ph.D. Graduate Student
Texas A&M University
College Station, Texas

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Summary: Auxin-resistant traits in cotton have become widely embraced across the Cotton Belt for management of glyphosate-resistant and other troublesome weeds. With this new adoption, off-target movement and spray tank contamination have become major concerns for growers, especially in southern and eastern Texas, where both XtendFlex and Enlist Cotton have significant market shares. The objective of this project is to identify the efficacy of recovery sprays from induced injury of dicamba and 2,4-D. A dicamba rate of 1.28 fl.oz/ac (0.10X) and a 2,4-D rate of 0.12 fl.oz/ac (0.05X) were applied separately at first-bloom stage on variety FM 1953 GLTP over the center two rows with a hand boom. Seven days later, numerous plant growth regulators and various nutritional and hormonal chemistries were applied with a four-row hand boom. Visual auxin injury ratings were conducted 2 weeks after application spray of the recovery treatments and again 1 week before application of harvest aids to assess both the amount of injury and recovery. Plant height, nodes, maturity, and planting mapping were conducted on five plants from each plot to identify the exact vegetative and reproductive physiological impacts of the various treatments. Plots were mechanically harvested. Visual ratings of the 2,4-D portion resulted in less overall foliage injury, but dicamba treatments had more stunting. There were no significant yield differences among the 2018 dicamba treatments, but the 2,4-D treatments showed more variation between treatments. In 2019, there were no differences between recovery treatments on the auxin-injured cotton.

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