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>