Purple nutsedge (Cyperus rotundus L.) is considered
the world’s worst weed because of its ability to survive,
spread, and compete. Holm et al. (5) reported purple
nutsedge in 52 crops in 92 countries (5–7). In addition
to its threat to agricultural lands, purple nutsedge is a
troublesomeweed in urban areas and natural communities
following disturbance. Although it rarely sets viable seeds,
purple nutsedge produces numerous rhizomes that can
penetrate and completely pass through root crops and
even asphalt (50,51). These rhizomes give rise to tubers
that give rise to a new plant, produce another rhizome, or
remain dormant during periods of adverse environmental
conditions, including heat, cold, drought, flooding, or lack
of soil aeration (49,52,53).
