A similar conclusion was also suggested by Ascough et al. (2008) from studies of colchicine and oryzalin with Watsonia lepida N.E. Brown.This is likely to be a consequence of little, if any, uptake, transport or translocation of oryzalin in shoot explants. Oryzalin has been shown to be rapidly taken up in corn root apices with uptake reaching a plateau within 4 h of treatment