Efficacy of Recovery Sprays to Auxin Injured Cotton

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 has become a major concern for growers, especially in South and East Texas where both XtendFlex™ and Enlist™ Cotton have significant market share.  The objective of this project is to identify the efficacy of recovery sprays from dicamba and 2,4-D induced injury.  A rate of 0.12 and 1.28 of 2,4-D and dicamba were applied at first bloom stage over the center two rows with a hand boom.  Seven days later, numerous plant growth regulators, various nutritional and hormonal chemistries were applied.  Visual auxin injury ratings were conducted two weeks after application spray of the recovery treatments and again one week prior to application of harvest aids to access both the amount of injury and recovery, respectively.  Plant height, nodes, maturity, and planting mapping were conducted on five plants from each plot to identify exact vegetative and reproductive physiological impacts of the various treatments.  Plots were mechanically harvested and fiber will be analyzed with HVI.