How do you lessen the growth of cogon grass?

Cogon is a perennial grass that spreads by rhizomes, making it very hard to eliminate. Periodic applications of herbicides such as Glyphosate (Roundup, Accord, generics) and Imazapyr (Arsenal, Chopper, generics) can provide temporary reduction in growth, especially when combined with frequent mowing. Tilling and then planting dense cover crops can help to smother the grass.