Fire lane going too green

The effects of herbiciding of the fire lane were short-lived. The same vegetation emerged as before as well as some unwanted pioneers.

I'm trying to keep the Guinea grass under control because it makes the lane impassable.

I'm trying to control the Natal grass on the west side because that's the only section where there are some neat native flatwoods herbaceous plants.

My success is a matter of personal speculation at the moment.