Weed control is one of the most important factors affecting yield.
America enjoys the most abundant, affordable, and safe food supply in the world due, in part, to its ability to control weeds. Our ability, however, to keep invasive weeds in check is being curbed for dubious reasons. Invasive noxious weeds are a significant problem for America s agricultural community. The Department of the Interior has estimated that invasive weeds infest 100 million acres of land in the United States, costing farmers and consumers billions. One Montana rancher, Libby McClay, estimates that knapweed slashed productivity.