Need help on Cogongrass

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Only, glyphosate (Roundup, etc.) and Stalker herbicide (imazapyr) have been found to be effective, but long-term control is rarely achieved.
Stalker is an extremely effective herbicide that controls a variety of weeds, from herbaceous to woody species. One or two applications of Stalker (2 qt/A) will often effectively control cogongrass for 18 to 24 months. However, there are several disadvantages to using this herbicide. First, Stalker will severely injure or kill forage grasses such as bermudagrass and bahiagrass. It also has a long soil half-life and will remain in the soil for several months after application. This often leads to "bare ground" for up to 6 months in the application area due to the non-selective nature of this herbicide. Stalker also has the potential to move down slopes during periods of rainfall, killing or injuring other species in the runoff area. Secondly, Stalker can only be used as a spot-treatment with no more than 10% of the pasture area treated per year.

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