Control of green and false-green kyllinga (Kyllinga brevifolia and K. gracillima) in golf course fairways and roughs.
Field trials were conducted in North Carolina golf courses to evaluate green (K. brevifolia) and false-green (K. gracillima) kyllinga control at fairway and rough golf course mowing heights. Treatments included single and sequential applications of bentazone (1.12 kg a.i./ha), halosulfuron (0.07 kg/ha), MSMA (2.24 kg/ha) and trifloxysulfuron (0.03 kg/ha); imazaquin (0.56 kg/ha) with and without MSMA; and 2 rates of sulfentrazone (0.42 and 0.56 kg/ha). Green or false-green kyllinga control was equivalent at fairway and rough mowing heights. Halosulfuron applied sequentially, imazaquin with and without MSMA, and trifloxysulfuron applied singly or sequentially controlled green and false-green kyllinga by 89-99% at 10 weeks after initial treatment. However, Kyllinga spp. control decreased over the course of the study regardless of herbicide treatment. By one year after treatment (YAIT), bentazone or MSMA alone controlled green or false-green kyllinga by 50% or less. No difference was observed in green or false-green kyllinga control between imazaquin vs. imazaquin + MSMA, sulfentrazone 0.42 vs. 0.56 kg/ha, or trifloxysulfuron one vs. 2 applications at any rating date. Green kyllinga appeared to be more difficult to control than false-green kyllinga. Sequential applications of bentazone and MSMA, single applications of halosulfuron, sulfentrazone applied at 0.42 and 0.56 kg/ha, and single and sequential applications of trifloxysulfuron controlled false-green kyllinga by at least 10% greater than green kyllinga at 1 YAIT.