Full TGIF Record # 225571
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=207
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Publication Type:
i
Report
Author(s):Waltz, F. C. Jr.; Murphy, T. R.
Author Affiliation:The University of Georgia, Griffin, GA
Title:Yellow nutsedge (Cyperus esculentus) control in bermudagrass (Cynodon spp.) turf
Section:Weed management in turf
Other records with the "Weed management in turf" Section
Meeting Info.:Jacksonville, Florida: January 27-30, 2008
Source:2008 Proceedings, Southern Weed Science Society. Vol. 61, 2008, p. 110.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Application rates; Application timing; Cynodon; Cyperus esculentus; Herbicide efficacy; Herbicide evaluation; Herbicide injury; Weed control
Abstract/Contents:"Yellow nutsedge (Cyperus esculentus) is a perennial grass like herb with three-ranked basal leaves. It forms round, hairless, belowground tubers at ends of whitish rhizomes. Tubers can remain viable for ten or more years. Yellow nutsedge occurs in moist to dry disturbed environments and is widespread throughout the U.S. Because of its yellowish-green leaves and rapid spreading characteristics, yellow nutsedge can become a problematic weed in turfgrass stands. The objective of these studies was to evaluate various herbicides for preemergence and postemergence control in turfgrass. Three studies were used to investigate herbicide application timing, rate, and reapplication interval. For all studies, herbicides were applied to a 20 year old stand of common bermudagrass (Cynodon spp.) infested with yellow nutsedge and mowed at 2 inches. A CO2 backpack sprayer set to deliver a spray volume of 25 gpa was used to apply all herbicide treatments. All treatments were visually evaluated for nutsedges control and turfgrass injury (data not presented). Study 1: Herbicides used in Study 1 include Dismiss (sulfentrazone) applied at 0.25 and 0.375 lbs A/A, Echelon (sulfentrazone + prodiamine) at 0.75 and 1.25 lbs A/A, and Pennant (s-metolachlor) applied at 2.5 lbs A/A. A nontreated control was included. All treatments were applied to separate plots on March 9, 2007 (A application) and April 10, 2007 (B application). Both application dates were prior to observable yellow nutsedge emergence and 0% and 35% bermudagrass green-up, respectively. Study 2: Dismiss was the only herbicide used in Study 2. It was applied at three rates (0.125, 0.188, and 0.25 lbs A/A) and included three reapplication timings with the initial application on June 25, 2007 (A application). Plots were retreated at intervals of four weeks (July 23, B application), five weeks (July 30, C application), or six weeks (August 8, D application) after the initial application. Study 3: Study 3 evaluated two rates of Dismiss at 0.25 and 0.375 lbs A/A, Monument (trifloxysulfuron) at 0.016 and 0.025 lbs A/A, and Certainty (sulfosulfuron) at 0.035 and 0.059 lbs A/A. Each herbicide and rate was applied as a single treatment only or included a sequential application four weeks after the initial application. Plots were initially treated on July 7, 2007 (A application) and sequential applications were made on August 8 (B application). From Study 1, it was determined that the herbicides and rates used did not provide acceptable season-long preemergence control of yellow nutsedge when applied to dormant or greening bermudagrass. Echelon at 1.125 lbs A/A had greater than 90% control three months after the March application (June rating), but fell below 70% control, minimally acceptable, by 4 months (July rating). No treatment had better than 80% control two months after the April application, and control diminished for all treatments and rates thereafter. In Studies 2 and 3, it was determined that effective season-long postemergence control can be achieved with Dismiss, Monument and Certainty. Herbicide rates and reapplication timing can affect longevity of control. From Study 2, when Dismiss was reapplied 28 days after the initial application, greater than 87% control was achieved for an additional 46 days - yellow nutsedge was controlled for 74 days with a sequential application at 4 weeks. Control diminished for the same time interval as sequential applications were extended to five and six weeks after the initial application. Study 3 had similar results for Dismiss, Monument and Certainty. When a sequential application was applied 32 days after the initial, greater than 90% control was observed for all treatments for an additional 31 days. By 73 days after the sequential application, yellow nutsedge control exceeded 80% for all treatments except Certainty at 0.035 lbs A/A."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Waltz, F. C. Jr., and T. R. Murphy. 2008. Yellow nutsedge (Cyperus esculentus) control in bermudagrass (Cynodon spp.) turf. South. Weed Sci. Soc. Proc. 61:p. 110.
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http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=207
    Last checked: 07/24/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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