The time of application and how the herbicides are applied depends on whether it is best to use a selective herbicide or a nonselective herbicide. Because nonselective herbicides that control bermudagrass also kill or injure other grasses, do not apply them to a mixed turf or the other grass species in the turf will also be injured or killed. Early spring is the best time to apply selective herbicides. For best control with these selective materials, make an application in spring when new bermudagrass growth is less than 6 inches in length, then reapply the herbicide before the regrowth reaches 6 inches in length. Additional applications may be needed as new growth occurs.
Control is increased if the plant is growing well with plenty of leaf area.
Plants that are drought stressed, insect damaged, or with dust on the leaves will not be controlled. Nonselective herbicides are generally applied later in spring or summer when bermudagrass is growing rapidly. Nonselective herbicides will injure most plants if sprayed on them, thus care must be taken to avoid contact with desirable plants. For it to be most effective, apply it to vigorously growing bermudagrass that is not stressed. Do not mow the grass for 2 to 3 weeks before applying it and withhold water for 2 to 3 days after an application.