Weeds are one of the greatest limiting factors to
efficient crop production. As a consequence of structural and
financing problems the cultural condition of the soil deteriorates
and weeds proliferate; many species are hard to kill (Farkas,
2006). Weed infestation, results in severe reduction in crop
yield as in the condition of pure corn culture, corn losses of 40–
60% have been reported (Thobatsi, 2009).