Comparison of Sulfonylurea Herbicides in Turf for Spring Transition

Abstract

Flazasulfuron and rimsulfuron were the most active in removing ryegrass within two weeks of application. Chlorsulfuron and the higher rates of foramsulfuron and trifloxysulfuron were moderately active in removing ryegrass. Sulfosulfuron, metsulfuron, and the lower rate of foramsulfuron were least active. All treatments including the untreated check had transitioned nearly completely in six weeks. Flazasulfuron, rimsulfuron, metsulfuron, chlorsulfuron, and sulfosulfuron treatments did not vary significantly between low and high rates that were tested. The higher rates of foramsulfuron and trifloxysulfuron were significantly more effective than the low rates that were tested. Flazasulfuron was the most injurious and delayed bermudagrass transition.