CYPERUSROTUNDUS

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).