One of the most effective methods for controlling zoysiagrass involves chemical sprays that kill off the grass at the surface level and in the soil. Chemical sprays have the potential to kill other grass and beneficial plants, as well.
Keeping zoysiagrass cut short and unable to produce seed helps control the reproduction of the grass, making future generations unlikely to emerge. Regular lawn mowing helps keep the zoysiagrass from setting seed each year.
Seeding other types of competitive grass or planting other things, including shrubs, flowers and trees, in the lawn helps reduce the area where the zoysiagrass can grow. Other grass types help crowd out and replace the existing zoysiagrass.