When we launched No-Till Farmer in 1972, paraquat was the No. 1 burndown herbicide. While it has lost much of its popularity to glyphosate, Mark Loux says it is one of those herbicides (marketed as Gramoxone by Syngenta) that could have been used much more in recent years to help control marestail and to interrupt the continuous glyphosate use cycle. The Ohio State University weed scientist says paraquat is most effective on small annual weeds.