Abstract
Late summer goosegrass control is difficult in turfgrass as POST herbicide efficacy is reduced on mature plants. Field
experiments were conducted to evaluate single and sequential nicosulfuron applications tank-mixed with foramsulfuron or
sulfentrazone for late summer goosegrass control and safety to bermudagrass and seashore paspalum. All single-treatment
applications controlled goosegrass , 62%, whereas sequential sulfentrazone, nicosulfuron, and nicosulfuron +
sulfentrazone applications controlled goosegrass 52, 73, and 84%, respectively. Sequential foramsulfuron applications
controlled goosegrass , 55% but nicosulfuron tank-mixtures did not improve control. Bermudagrass was injured , 20%
by 1 and 3 wk after all single and sequential treatments. Sequential treatments of nicosulfuron alone or tank-mixed with
sulfentrazone caused unacceptable seashore paspalum injury (. 20%) 1 and 3 wk after the second application, whereas
foramsulfuron or sulfentrazone alone applied sequentially caused , 17% injury. Seashore paspalum seedhead control at
9 wk after intial treatment was poor (, 70%) from all single-application treatments and sequential sulfentrazone
applications, but control was good (80 to 89%) to excellent (. 90%) from all other treatments. Overall, sequential
treatments of nicosulfuron alone or tank-mixed with sulfentrazone appear to have potential for POST control of mature
goosegrass in bermudagrass, but seashore paspalum injury was unacceptable.
