Poa trivialis: Can I Control It?
|Author:||S. D. Askew|
|Author Org:||Virginia Tech|
|Presenter:||S. D. Askew|
|Conference:||Kansas Turf Conference|
|Abstract:||This presentations summarizes the results of seven field trials that evaluated two rates of Velocity Herbicide (bispyribac sodium) as single treatments or multiple treatments for roughstalk bluegrass (Poa trivialis) control. Velocity injured creeping bentgrass initially at all locations but bentgrass recovered within three weeks of treatment at all but one location. At one location, injury persisted for 10 weeks when treatments were initiated in the summer or fall but not when treatments were initiated in spring. Velocity controlled roughstalk bluegrass when applied three times at two-week intervals but not when applied only once. When treatments were initiated in summer or fall, Velocity controlled roughstalk bluegrass 40 to 60% 10 weeks after initial treatment (WAT). When treatments were initiated in summer, Velocity controlled roughstalk bluegrass 90% at 10 WAT. Results suggest that Velocity must be applied multiple times to control roughstalk bluegrass and treatments are best initiated in the spring. |