Annual Bluegrass (Poa Annua) Control in Creeping Bentgrass (Agrostis Stolonifera) Putting Greens with Bispyribac-sodium

Annual bluegrass is one of the most difficult-to-control weeds in creeping bentgrass putting greens. Field trials were conducted in 2003 and 2005 to evaluate bispyribac-sodium for annual bluegrass management in creeping bentgrass greens maintained at a 3 mm mowing height. Bispyribac-sodium applied w...

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Bibliographic Details
Published in:Weed technology 2007-04, Vol.21 (2), p.426-430
Main Authors: Teuton, Travis C, Main, Christopher L, Sorochan, John C, McElroy, J. Scott, Mueller, Thomas C
Format: Article
Language:English
Subjects:
adverse effects
Agrostis stolonifera
AGSST
Annuals
appearance (quality)
bispyribac-sodium
Depopulation
field experimentation
Golf courses
grass weeds
height
Herbicides
lawns and turf
nontarget organisms
Perennials
plant damage
Plant growth regulators
Poa annua
POANN
Population growth
Sodium
Sustainable agriculture
Turf grasses
turf quality
weed control
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Summary:Annual bluegrass is one of the most difficult-to-control weeds in creeping bentgrass putting greens. Field trials were conducted in 2003 and 2005 to evaluate bispyribac-sodium for annual bluegrass management in creeping bentgrass greens maintained at a 3 mm mowing height. Bispyribac-sodium applied weekly at 12 or 24 g ai/ha controlled annual bluegrass 86% 12 wk after initial treatment (WAIT). In 2003, bispyribac-sodium applied at 12 and 24 g/ha/wk injured creeping bentgrass approximately 15 and 50% by 4 WAIT, respectively. However, injury was transient and was not evident by 12 WAIT. In 2005, the 12 and 24 g/ha/wk injured creeping bentgrass 15 and 85% by 8 WAIT, respectively, and was still evident throughout the trial. Putting green quality was reduced when compared to nontreated creeping bentgrass by the same treatments. The removal of annual bluegrass caused soil exposure until creeping bentgrass grew over the bare areas, contributing to decreased quality evaluations. Management of annual bluegrass in creeping bentgrass putting greens is possible with bispyribac-sodium. However, these results indicate bispyribac-sodium can cause excessive injury when applied to creeping bentgrass mowed at 3 mm. Nomenclature: Bispyribac-sodium; annual bluegrass, Poa annua L. POANN; creeping bentgrass, Agrostis stolonifera L. AGSST, ‘Penncross’.
ISSN:0890-037X
1550-2740
DOI:10.1614/WT-06-023