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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2006 Proceedings-SWSS.pdf#page=163
Last checked: 07/19/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Willis, T. G.;
Estes, A. G.;
McCarty, L. B. |
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| Author Affiliation: | Department of Horticulture, Clemson University, Clemson, SC. |
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| Title: | Postemergence annual bluegrass control in creeping bengrass [bentgrass] putting greens |
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| Section: | Weed management - agronomic crops
Other records with the "Weed management - agronomic crops" Section
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| Meeting Info.: | San Antonio, Texas: January 23-25, 2006 |
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| Source: | Proceedings: Southern Weed Science Society 59th Annual Meeting. Vol. 59, 2006, p. 90. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Golf greens; Herbicide efficacy; Herbicide evaluation; Poa annua control; Postemergence weed control
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| Abstract/Contents: | "Creeping bentgrass (Agrostis palustris subsp. stolonifera) is a popular C3 turfgrass utilized as golf course putting green surfaces. During high summer temperatures, creeping bentgrass becomes stressed and more susceptible to weed invasion. Annual bluegrass (Poa annua ssp.reptans) is a very common and troublesome weed in creeping bentgrass putting greens. Annual bluegrass is lighter in color and a noxious seedhead producer disrupting the playability and aesthetic value of putting greens. Options for selective postemergence annual bluegrass control in creeping bentgrass are limited. In order to shift the competitive advantage to bentgrass, plant growth regulators (PGRs) are often used. PGRs are also used to suppress annual bluegrass seedheads improving the playability of the putting surface and reducing reproduction of the annual bluegrass. A study was conducted in 2005 on a golf course in Salem, South Carolina to evaluate postemergence annual bluegrass control in creeping bentgrass putting greens. The study was conducted from February through December 2005. Individual treatments (common name, rate in kg ai/ha) included; Velocity (bispyribac-sodium, 0.01), Prograss (ethofumesate, 0.455), Primo MAXX (trinexapac-ethyl, 0.035), Trimmit (paclobutrazol, 0.223), Embark T&O (mefluidide, 0.112), Cutless (flurprimidol, 0.14), and Proxy (ethephon, 3.04). Tank-mixed treatments (rate in kg ai/ha) included; Velocity + Trimmit (0.03 + 0.112), Ve locity + Primo MAXX (0.01 + 0.035), Prograss + Primo MAXX (0.455 + 0.035), Trimmit + Primo MAXX (0.223 + 0.035), Embark T&O + Primo MAXX (0.112 + 0.035), Cutless + Primo MAXX (0.14 + 0.035), and Proxy + Primo MAXX (3.04 + 0.035). Treatments were applied monthly with the exception of the Velocity and Velocity + Primo MAXX treatments which were applied every 10 days. Treatment applications were initiated on 18 February 2005 and continued through 15 May 2005, stopped during summer, and resumed 12 September 2005. Turfgrass quality, annual bluegrass injury, and bent grass injury were rated every two weeks and annual bluegrass seedhead suppression was rated in late spring and early summer when most evident. Turfgrass quality was visually rated on a scale from 1-9 with 1 = dead turf, 9 = excellent turf, and 7 = minimum acceptable turf. Annual bluegrass and bentgrass injury was visually rated on a scale from 0-100% with 30% = maximum level of acceptable injury. Annual bluegrass seedhead suppression was visually rated as a percentage of ground cover on a scale from 0-100%. Prograss and Velocity + Trimmit provided >= 40% annual bluegrass injury on 31 May 2005. Prograss reduced turfgrass quality below the minimum acceptable range when a pplied in spring. Spring applications of Embark T&O and Embark T&O + Primo provided >= 20% annual bluegrass injury. Although turf quality was reduced following applications of Embark T&O and Embark T&O + Primo, these remained above the minimum acceptable range. Spring applications of Velocity and Embark T&O provided >= 80% annual bluegrass seedhead suppression while >= 90% was achieved by spring applications of Proxy, Proxy + Primo, and Velocity + Trimmit. Fall applications of Prograss, Prograss + Primo, Velocity + Primo, and Trimmit + Primo provided >= 10% annual bluegrass injury with no reduction in turfgrass quality. Fall applications of Embark T&O and Embark T&O + Primo provided >= 10% annual bluegrass injury with a 6 and 15% reduction in turfgrass quality. Bentgrass injury following Embark T&O + Primo applications was 40% less than when Embark T&O was applied alone. In conclusion, spring applications of Velocity + Trimmit provided the greatest amount of annual bluegrass injury with no reduction in turfgrass quality. However, when turfgrass quality was previously evaluated, a reduction was observed following Velocity + Trimmit applications indicating that the 0.03 kg ai/ha may be too aggressive where annual bluegrass populations are high. Spring applications of Velocity, Proxy, Proxy + Primo, and Velocity + Trimmit provided the greatest amount of seedhead suppression with no reduction in turfgrass quality. Fall applications of Prograss, Prograss + Primo, and Velocity + Primo provided the greatest amount of annual bluegrass injury with no reduction in turfgrass quality." |
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| Language: | English |
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| References: | 0 |
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| Note: | "Vision for the future"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Willis, T. G., A. G. Estes, and L. B. McCarty. 2006. Postemergence annual bluegrass control in creeping bengrass [bentgrass] putting greens. South. Weed Sci. Soc. Proc. 59:p. 90. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2006 Proceedings-SWSS.pdf#page=163
Last checked: 07/19/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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