​​Efficacy of Recovery Sprays to Auxin Injury on Cotton

December 2019 | 5 min., 49 sec.
by James A. Griffin
Texas A&M University


​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.

About the Presenter

James A. GriffinJames A. Griffin worked on the family farm with his grandfather and learned about the value of the Extension service to farmers. After deciding to become an Extension agent, he attended the University of Tennessee at Martin for his bachelor’s degree and then the University of Tennessee at Knoxville for his master’s degree—both in agriculture economics. After 6 years in the University of Tennessee Extension service, he went into the retail sector. That experience was both invaluable and challenging and forged many close relationships. After 5 years in retail, he had the opportunity to work for himself as an independent crop consultant. He obtained much satisfaction from scouting but always desired to obtain his doctorate degree. He began work on his PhD in the fall of 2017 under Gaylon Morgan at Texas A&M University.

Contact Information:
Email: jgriff15@tamu.edu


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