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Rezilon herbicide in bermudagrass

Rezilon (indaziflam), produced by Bayer, is now available for use in Alabama. This product is a new chemical mode of action (Group 29) not seen before in the forage market. It is labeled for use on established bermudagrass, bahiagrass, and other perennial warm season forage grasses. This preemergence herbicide is designed to provide residual control of many annual grasses and broadleaf weeds.

Rates and Application

Labeled rates should not exceed 5 fluid ounces per acre in a single application and should not exceed 6 fluid ounces per acre in a 12-month period. There is a limit of two applications of Rezilon in a 12-month period. For hay production, there is a 40-day restriction for any single application that exceeds 3 fluid ounces per acre. However, there are no grazing restrictions with Rezilon.

Because this is a preemergence herbicide, rainfall is necessary in order for the chemical to reach the soil surface and provide control of germinating seedlings. Applications of Rezilon should be made several weeks ahead of anticipated weed seed germination. In general, for control of cool season annual weeds, such as volunteer annual ryegrass, it is best to make an application in early September (Labor Day) if possible. For warm season weeds, such as crabgrass, applications in February (Valentine’s Day) would be an appropriate timing for most Alabama producers.

Compared to other preemergence herbicides, such as Prowl H2O, Rezilon persists longer on the soil surface without degradation, which gives growers more application flexibility. Therefore, it is better to apply a month too early than a day too late. When warm season forages are dormant, a tank mixture of Rezilon and a non-selective herbicide like Roundup (glyphosate) may be applied to control existing unwanted weeds. Keep in mind that weed species pressure and environmental conditions will vary.

More Information

This product is expected to be available to retailers by early September. Read the label carefully for more information on proper PPE, tank mix partners, weed species control, mixing instructions, rotational crop restrictions, and other parameters for use.

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