77-10 Herbicide and Plant Growth Regulator Programs for Controlling Annual Bluegrass (Poa annua L.) in Recently Established Creeping Bentgrass (Agrostis palustris Huds.) Fairway Turf.

Poster Number 241

See more from this Division: C05 Turfgrass Science
See more from this Session: Turfgrass Pest Management
Monday, November 1, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Ronald Calhoun and Aaron Hathaway, Michigan State University, East Lansing, MI
Annual bluegrass (Poa annua L.) [ABG] is a cosmopolitan weed that can be found anywhere in the world where human activity is present. ABG quickly invades creeping bentgrass (Agrostis palustris Huds.)[CBG] fairways in cool-temperate climates. Chemical methods to limit ABG invasion include preemergence and postemergence herbicides and plant growth regulators [PGRs]. Two 3-factor trials were initiated in 2007 in East Lansing, Michigan to examine the effects of treatment combinations to limit ABG invasion in CBG fairways with less than 5 percent initial invasion. Factors included preemergence herbicide, at three levels: none, dithiopyr, or cumyluron; PGR, at three levels: none, flurprimidol, or paclobutrazol; and postemergence herbicide, at two levels: none or bispyribac-sodium. ABG populations were determined in the spring and fall of each year. Treatment combinations including PGR and bispyribac-sodium and paclobutrazol + cumyluron reduced ABG cover by 93, 96, and 96% in the spring of 2008, 2009, and 2010, respectively. Turfgrass injury was evaluated throughout the trial period on a 1-9 scale where, 1=no injury and 9= complete blighting. Turfgrass injury associated with the same treatment combinations averaged 5.0, 3.0, and 4.0 during the fall assessments in 2007, 2008, and 2009, respectively.
See more from this Division: C05 Turfgrass Science
See more from this Session: Turfgrass Pest Management