Which herbicide is primarily used for pre- and post-emergence annual bluegrass control on perennial ryegrass golf course fairway turf?

Which herbicide is primarily used for pre- and post-emergence annual bluegrass control on perennial ryegrass golf course fairway turf?

• A. Prograss (ethofumesate)
• B. Ronstar (oxadiazon)
• C. Surflan (oryzalin)
• D. Team (benefin + trifluralin)

Answer: (A)

Controlling Poa annua on perennial ryegrass fairways requires a product that can hit the weed both before it germinates and after it has emerged. Ethofumesate (Prograss) fits this need because it provides postemergence activity against Poa annua in established cool-season turf, while also giving preemergence control. It’s absorbed and translocated in the plant, offering residual control of emerged Poa annua and prevention of new seedlings in the same season. The other options are mainly preemergents that prevent Poa annua seeds from germinating and have limited or unreliable postemergence activity on emerged Poa annua, making them less suitable for a strategy that targets both pre- and post-emergence control on a mature ryegrass fairway. So Prograss is the best choice for this scenario.

Controlling Poa annua on perennial ryegrass fairways requires a product that can hit the weed both before it germinates and after it has emerged. Ethofumesate (Prograss) fits this need because it provides postemergence activity against Poa annua in established cool-season turf, while also giving preemergence control. It’s absorbed and translocated in the plant, offering residual control of emerged Poa annua and prevention of new seedlings in the same season.

The other options are mainly preemergents that prevent Poa annua seeds from germinating and have limited or unreliable postemergence activity on emerged Poa annua, making them less suitable for a strategy that targets both pre- and post-emergence control on a mature ryegrass fairway. So Prograss is the best choice for this scenario.