The perennal weeds under study i.e. cogongrass imperata. All treatments gave significant effect on controling the perennial weeds mixture mentioned above. Glyphosate (Roundup 48 %) at 4.0 ljfed. either used once or twice was the superior herbiode for controlling the perennial weeds .That
was true Ni the four surveys at 3, 6, 9 and 12 weeks and in both seasons, this may be due to the tact that this herbicide has a non selective effect and translacte effectively In the growing part of annual and perennial weeds. According to the reduction of the perennial weeds population estimated by visual assessment and
the number/rn?, the treatments could be arranged in the a descending order: Roundup at 4.0 I/fed, used twice and once,
Fusilade Super at 2.0 1,/fed used twice and once, mukhing by banana leaves, hand hoeing at four times and the lowest reduction
was the cutting at three times in the four surveys in the first season, Roundup at 4,0 I/fed, used twice and once, hand hoeing
four times, Fusilade Super used 2.0 V fed used twice, mulching by leaves, Fusilade Super at 2.0 I/ fed used once and the lowest was
the cutting three times, compared to un treated control in the four surveys in the second season.Another study, was conducted to
estimate the predictive equations between the effective dose of glyphosate (Herbazid) and kiling percent of the above four
perennial weeds. The best control percent was done by using 4 I/fed. Concentration oW four weed under study.