What is the best way of ridding Zoysia of Bermuda, I used Fusilade II but it really doesn't work very well, I used .75 oz. per gallon with 1/2 oz. surfactant per gallon, is this to weak for spot spraying? Any help is appreciated. I have also decide to bite the bullet this year and started killing it off with Round up but it seems like the roots just aren't being killed off since it starts to pop up again on the outside of the kill off, I hate it!