Abstract:  Creeping bentgrass infestations in cool-season turfgrass are unsightly and difficult to control.  Field tests were conducted at Stoney Creek Golf Course in Wintergreen, VA in 2002 and 2003 on a Kentucky bluegrass rough and at the Turfgrass Research Center in Blacksburg, VA in 2003 on a perennial ryegrass lawn to determine efficacy of imazaquin, isoxaflutole, and mesotrione for creeping bentgrass control and turfgrass tolerance.  Isoxaflutole and mesotrione each applied in two sequential applications at 280 g ai/ha or three sequential applications at 170 or 60 g/ha and imazaquin in two sequential applications at 390 g/ha controlled bentgrass at least 92% 14 weeks after initial treatment (WAIT) at all locations.  Sequential applications were applied on two-wk intervals.  Isoxaflutole and mesotrione, regardless of rate or sequential treatment, injured turfgrass less than 20% at all rating dates and locations.  Imazaquin in two sequential applications at 390 g/ha injured Kentucky bluegrass and perennial ryegrass greater than 50% at all locations 14 WAIT.  Results indicate isoxaflutole or mesotrione could be used for selective bentgrass control in Kentucky bluegrass or perennial ryegrass. 

Nomenclature:  Imazaquin; isoxaflutole; mesotrione; creeping bentgrass, Agrostis stolonifera L. #  AGRST; Kentucky bluegrass, Poa pratensis L. ‘Blacksburg’ and ‘Midnight’; perennial ryegrass, Lolium perenne L. ‘Prosport’.

Additional index words:  Golf course rough, turfgrass injury, weed control.
Abbreviations:  SCG 2002, Stoney Creek Golf Course, Wintergreen, VA 2002; SCG 2003, Stoney Creek Golf Course, Wintergreen, VA 2003; TRC 2003, Turfgrass Research Center, Blacksburg, VA 2003; WAIT, weeks after initial treatment.

 

Citation:  Beam, J. B., W. L. Barker, and S. D. Askew.  2006.  Selective creeping bentgrass (Agrostis stolonifera) control in cool-season turfgrass.  Weed Technol. 20:340-344.