02081naa a2200241 a 450000100080000000500110000800800410001910000160006024500880007626000090016452014130017365300190158665300210160565300140162665300140164065300180165465300190167265300270169165300250171870000190174370000230176277300540178510400462005-09-22       2005    bl uuuu     u00u1 u    #d1 aTOLER, J.E.  aNew Options for Annual Bluegrass Control in Overseeded Bermudagrass Putting Greens.  c2005  aAnnual bluegrass (Poa annua L.) continues to be a problem in bermudagrass golf greens overseeded with roughstalk bluegrass (Poa trivialis L. ?Sabre?) due to weed encroachment from adjacent fairways, lack of selective herbicide options, and weed diversity. A 2-year study was conducted on an overseeded ?Tifgreen? bermudagrass putting green to evaluate effects of herbicide treatments on overseeding and annual bluegrass control. Excellent annual bluegrass control (=90%) and acceptable turfgrass cover (?70%) was achieved with oxadiazon at 2.2 kg??ha?1 a.i. applied 60 days before overseeding (DBO). Fenarimol (AS) at 4.1 kg??ha?1 a.i. (30 + 15 DBO) followed by 1.4 kg??ha?1 a.i. 60 days after overseeding (DAO) and dithiopyr at 0.6 kg??ha?1 a.i. (60 DBO + 120 DAO) also provided acceptable results. Dithiopyr at 0.4 kg??ha?1 a.i. (30 DBO + 120 DAO), dithiopyr at 0.3 kg??ha?1 a.i. (30 DBO + 30 + 120 DAO), and fenarimol (G) at 2.0 kg??ha?1 a.i. (45 + 30 DBO) followed by 0.8 kg??ha?1 a.i. 60 DAO provided inconsistent annual bluegrass control (55% to 75% in 1999 and 87% to 95% in 2000), but offered acceptable turfgrass cover (?70%) each year. The remaining treatments were generally ineffective and provided &lt50% annual bluegrass control one or both years. Oxadiazon applied 60 DBO at 2.2 kg??ha?1 a.i. provides an excellent option for annual bluegrass control in overseeded bermudagrass putting greens.  aCapim de burro  aCynodon dactylon  aHerbicida  aPoa annua  aPoa trivialis  aPre-emergencia  aPreemergence herbicide  aRoughstalk bluegrass1 aMCCARTY, .L.B.1 aHIGINGBOTTOM, J.K.  tHortscience, Alexandriagv.38, n.6, 2003. CD-ROM.