Palmer Amaranth Control and Cotton Response to Early Preplant and Preemergence Applications of Residual Herbicides

Glyphosate-resistant Palmer amaranth has been identified in 10 Tennessee counties.  In order to be able to grow cotton in the future soil applied herbicides will be needed to manage this pest.  As a result, research was initiated that examined control of Palmer amaranth with herbicides applied 28 days before planting (DBP), 14 DBP and pre emergence.  The herbicides used in the study were Caparol, Prowl H2O and Reflex.  These herbicides were applied alone and in combinations with each other.  Cotton was unaffected by all the herbicides used in the study regardless of timing or herbicide tankmixtures.  The best Palmer amaranth control was with the applications made 14 DBP and the pre applications.  Other findings from this study will be highlighted.