The widespread adoption of glyphosate-tolerant crops and the advent of glyphosate-resistant horseweed (Conyza canadensis) have created a need for research investigating alternative measures of control for this troublesome weed. Since 2001, glyphosate-resistant populations of horseweed have been reported in several states across the United States, including Arkansas, Tennessee, and Mississippi. Horseweed is commonly found in undisturbed areas and has been listed as a problem weed in conservation and no-till systems Effective spring burndown options for horseweed are limited and environmental conditions may inhibit timely applications in spring. The use of fall-applied preemergence herbicides may help reduce spring populations of horseweed possibly eliminating the need for a spring burndown.