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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=324
Last checked: 08/12/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Cross, R. B.;
McCarty, L. B.;
Estes, A. G. |
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| Author Affiliation: | Clemson University, Clemson, SC |
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| Title: | Annual bluegrass control in creeping bentgrass putting greens |
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| Section: | Weed management in turf
Other records with the "Weed management in turf" Section
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| Meeting Info.: | Houston, Texas: January 28-30, 2013 |
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| Source: | Proceedings of the Southern Weed Science Society: 66th Annual Meeting. Vol. 66, 2013, p. 237. |
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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; Application rates; Application timing; Combination treatments; Comparisons; Golf greens; Growth regulator evaluation; Herbicide evaluation; Poa annua control; Susceptibility
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| Geographic Terms: | South Carolina |
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| Abstract/Contents: | "Annual bluegrass (Poa annua L.) is the most problematic winter annual weed for golf courses worldwide as it disrupts the aesthetic quality and playability of turf stands. Annual bluegrass commonly infests creeping bentgrass putting greens in the turfgrass "transition zone" of South Carolina. Moist conditions from handwatering/syringing, above ground fans, and high fertilizer and fungicide inputs increase its occurrence in creeping bentgrass putting greens. Susceptibility of creeping bentgrass to herbicides and the pace of annual bluegrass removal which leaves voids in playing surfaces provide challenges for acceptable control. The objective of this study was to evaluate herbicide and plant growth regulator treatments at various rates, timings, and combinations for annual bluegrass control in creeping bentgrass putting greens. The study was conducted from 2010 to 2012 at the Walker Golf Course in Clemson, SC on 'Crenshaw' creeping bentgrass putting greens. Plots were treated for 2 years and annual bluegrass infestations were greater than 50% at study initiation, consisting of both annual and perennial biotypes. Normal transition zone putting green maintenance was performed by the maintenance staff. The study was conducted in a randomized complete block design with 1.5 by 8 m plots and four replications. Treatments were applied using a CO2-pressurized backpack sprayer calibrated to deliver 20 gal/acre through 8003 flat fan nozzles (60 gal/acre for treatments containing methiozolin). Visual ratings were taken at numerous dates throughout the study and included annual bluegrass control and seedhead suppression from 0-100%, where 0% was no control or seedhead suppression and 100% was complete control or seedhead suppression. Additionally, turf quality was visually evaluated from 0-9 (9=best). Fall and spring treatments were initiated in mid-October and mid-February, respectively, in each year. After one year of treatments, annual bluegrass control in early May was >70% for methiozolin applied 6 times (3 fall, 3 spring; 1 wk intervals) at 0.5 lb ai/acre and 3 times (3 fall; 4 wk intervals) at 1 lb ai/acre. Paclobutrazol (8 applications at 16 oz/acre; 3 wk intervals) provided 60 % control. All other treatments provided <50% annual bluegrass control after one year. After two years of treatments, annual bluegrass control in early May was >95% for methiozolin applied 6 times (3 spring; 1 wk intervals) at 0.5 lb ai/acre and 3 times (3 fall; 1 wk intervals) at 1 lb ai/acre and 53% for paclobutrazol. All other treatments provided <35% annual bluegrass control. Seedhead suppression at both locations was >80% for paclobutrazol (8 applications at 16 oz/acre; 3 week interavls), paclobutrazol + amicarbazone (8 paclobutrazol applications at 16 oz/acre + 4 spring amicarbazone applications at 0.5 oz/acre; 1 week intervals), and all methiozolin treatments evaluated. After two years, turf quality was >7 for all treatments except amicarbazone applied 4 times in the spring at 1 oz/acre at 1 week intervals. The best option currently labeled for annual bluegrass control in creeping bentgrass putting greens in the SC transition zone is paclobutrazol, applied multiple times throughout the fall and spring at 16 oz/acre. Methiozolin is not currently labeled for use in the United States, but upon registration, should be applied 6-8 times at low rates (<=0.5 lb ai/acre) throughout the fall and spring for best annual bluegrass control. Future research will complete this study at a second site and continue evaluation of herbicides and plant growth regulators at various rates, timings, and combinations for annual bluegrass control in creeping bentgrass in the SC transition zone." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cross, R. B., L. B. McCarty, and A. G. Estes. 2013. Annual bluegrass control in creeping bentgrass putting greens. South. Weed Sci. Soc. Proc. 66:p. 237. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=324
Last checked: 08/12/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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