Full TGIF Record # 63089
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Publication Type:
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Content Type:Abstract or Summary only
Author(s):Bunnell, B. T.; Waltz, F. C.; Higingbottom, J. K.; McCarty, L. B.
Author Affiliation:Clemson University, Department of Horticulture, Clemson, SC. 29634-0375
Title:Annual bluegrass (Poa annua) control and overseeded grass establishment following pesticide use
Section:Weed management in turf, pastures and rangeland
Other records with the "Weed management in turf, pastures and rangeland" Section
Meeting Info.:52nd Annual Meeting, Greensboro, NC, January 25-27, 1999
Source:Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 70.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:1
Keywords:TIC Keywords: Poa annua control; Poa annua; Overseeding; Establishment; Pesticides; Application rates; Application timing; Cynodon dactylon; Cynodon transvaalensis; Golf greens; Preemergence herbicides; Postemergence herbicides; Lolium perenne; Pronamide; Fenarimol; Oxadiazon; Ethofumesate; Paclobutrazol; Trinexapac-ethyl; Dithiopyr; Poa trivialis; Myclobutanil; Propiconazole; Cyproconazole; Herbicide evaluation
Cultivar Names:Tifdwarf
Abstract/Contents:"Annual bluegrass (Poa annua) control in overseeded turf poses a long-term challenge to turfgrass managers. It's tufted growth habit, non-uniform color and noxious seedhead producion reduces the overall quality of highly maintained turfgrass arenas such as golf greens. Traditionally, seletively controlling Poa annua in other cool-season grasses has been elusive. The objective of this research was to provide control of Poa annua while allowing establishment of overseeded grasses following a variety of pesticide applications at various rates and timings. Three studies were performed in 1996, 1997, and 1998 in central SC on overseeded `Tifdwarf' bermudagrass (Cynodon dactylon x transvaalensis `Tifdwarf') golf greens. The 1996 and 1997 studies determined the efficacy of pre and postemergence applications for season long control of Poa annua and establishment of perennial ryegrass (Lolium perenne). Herbicide treatments included Kerb 50 WP (pronamide), Rubigan 1 AS and Patchwork 0.008 G (fenarimol), Ronstar 2G (oxidiazon), Prograss 1 EC (ethofumesate), Turf Enhancer 2 SC (paclobutrozol), Primo 1 EC (trinexapacethyl), and Dimension 1 EC (dithiopyr) with varying rates and application times. The 1998 study observed the effect of DMI (Demethylation Inhibitors) or sterol-inhibiting fungicides on germination and estalishment of rough bluegrass (Poa trivialis). Treatments included Rubigan 1AS, Eagle 40 WSP (myclobutanil), Banner 1.1 EC (propiconazole), Sentinel 40 WG (cyproconazole), and combinations of Turf Enhancer with Sentinel and Eagle at varying rates and timings. Visual ratings were taken monthly except in 1998, when two ratings were taken in early and late December. Poa annua control and overseeded grass cover and injury was rated on a 0-100% scale with 0%=worst and 100%=best. Minimum acceptable Poa annua control and overseeded grass cover was 70%, and maximum acceptable overseeded grass injury was 30%. The 1996 study showed best (>90%) long-term Poa annua control through April with Ronstar 2G (2.0 lbs ai/A) applied 45 DBO (Days Before Overseeding) and sequential applications of Prograss (1.5 lbs ai/A) in November and December. Prograss showed unacceptable (>30%) perennial ryegrass injury in February, however full recovery occurred by April. No significant turf injury was seen with other treatments. Best control (>90%) in 1997 followed Rubigan (0.375 lbs ai/A) applied 30, 15 DBO plus December (0.125 lbs ai/A), sequential applications of Prograss (1.5 lbs ai/A) in November plus December, and Dimension (0.25 lbs ai/A) applied 60, 30, 15 DBO (1.75 lbs ai/A), plus February. Good control (80-90%) followed applications of Ronstar 2G (2.0 lbs ai/A) 45 DBO, Patchwork 30, 15 DBO (1.75 lbs ai/A), plus December (0.70 lbs ai/A), and sequential applications of Dimension (0.5 lbs ai/A) 50 DBO plus February. Turf Enhancer (0.25 lbs ai/A) applied monthly from December through March provided good (≅80%) control in February, but only 30% control in April. Acceptable (>70%) perennial ryegrass cover followed December ratings of Rubigan, Kerb, Turf Enhancer, Primo, sequential applications of Dimension, and Patchwork. The 1998 DMI study showed acceptable (>70%) Poa trivialis cover with Rubigan and Banner applied at 0.375 lbs ai/A 45, 30 DBO, plus December at 0.125 lbs ai/A. Eagle provided acceptable cover in the second December rating. Tank mixes of Sentinel and Eagle with Turf Enhancer provided poor (<40%) Poa trivialis cover in both December ratings. No differences were seen in Poa trivialis germination. Ratings will continue through spring 1999. Research will continue on long-term Poa annua control with varying pesticide combinations, timings, and rates. DMI fungicides and sulfonylurea herbicides may potentially open new avenues of Poa annua control in overseeded turf. Additionally, improvements in establishment of overseeded turf species are necessary by adjusting seeding rates and dates".
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bunnell, B. T., F. C. Waltz, J. K. Higingbottom, and L. B. McCarty. 1999. Annual bluegrass (Poa annua) control and overseeded grass establishment following pesticide use. South. Weed Sci. Soc. Proc. 52:p. 70.
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