According to the Weed Science Society of America (WSSA) and Take Action on Weeds (2015), there are three broad indicators of possible herbicide resistance that could be used to evaluate the potential case of resistance:

UPL's PREVIEW 2.1 SC herbicide is a multi-mode-of-action herbicide that controls weeds early in the season and protects the crop with residual to limit the time that a second flush of weeds have to emerge.