How long can cotton tolerate the presence of tropical spiderwort before yield is affected?<BR>WEEDY Duration -  <BR>  Spiderwort competed for: <BR>	2 Wks <BR>	4 Wks <BR>	6 Wks <BR>	8 Wks <BR>	10 Wks <BR> <BR>WEED-FREE Duration   <BR>  Plots Free of Spiderwort for: <BR>	2 Wks <BR>	4 Wks <BR>	6 Wks <BR>	8 Wks <BR>	10 Wks<BR>Cotton Planted: <BR>30 April 2003  <BR>		(DP 555 BG/RR) <BR>18 May 2004*  <BR>		(DP 555 BG/RR) <BR>13 June 2004  <BR>		(DP 424 BGII/RR) <BR> <BR>Pendimethalin applied PRE <BR>Center-pivot irrigation as needed <BR>Naturalized population of spiderwort<BR>