may have accounted for the poor control of annual grasses seen
with the V3 application timing.
Thus, a non-residual herbicide like glyphosate applied once
early post-emergence typically does not provide season-long
control (Askew and Wilcut, 1999). Thomas et al. (2006) reported
that glyphosate controlled Amaranthus hybridus L. at least 78%
while Grichar (2006) reported that Amaranthus tuberculatus control
was 100% with all weed management systems which contained
glyphosate