2019-08-022019-08-022019-052019-05May 2019https://hdl.handle.net/2346/84988Glyphosate-resistant Palmer amaranth is a relatively new and significant threat to cotton production in West Texas. Field trials were conducted from 2013 to 2015 in locations around Lubbock, TX to determine Palmer amaranth response to existing residual herbicide options in cotton. This work showed that for Palmer amaranth to be controlled at least 90%, multiple applications of residual herbicides throughout the growing season were necessary. These included the use of preplant, at-plant, and postemergence residual herbicide options used in conjunction with effective postemergence-topical herbicides. Tillage is also an important part of Palmer amaranth management and the use of tillage practices improved Palmer amaranth control over herbicide use alone. A longitudinal survey tool was also implemented in order to track changes in grower weed management practices as glyphosate-resistance spread. This survey tool showed that grower awareness of glyphosate-resistance increased over a four year period and that management strategies changed to counter the growing threat.application/pdfengPalmer amaranthGlyphosate-resistanceLongitudinal surveyThesis2019-08-02Unrestricted.