Bp from Birmingham, Al writes
Katana Turf Herbicide should not be used on newly sodded grass until it has been established. It is likely established after two mowings. This product should be fine on your four month old zoysiagrass. The amount of product that should be applied depends on what you are treating for. Applications can be made every 4 weeks as needed. Please check the label for specifics.
Answer last updated on: 07/10/2015