Full TGIF Record # 225141
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=191
    Last checked: 07/18/2013
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Publication Type:
i
Report
Author(s):Askew, S. D.; Willis, J. B.; Ricker, D. B.; Grove, M. D.
Author Affiliation:Askew, Willis and Ricker: Virginia Tech, Blacksburg; Grove: ISK Biosciences Corporation, Houston TX
Title:Lateral mobility of transition-assisting herbicides via runoff water
Section:Weed management in turfgrass
Other records with the "Weed management in turfgrass" Section
Meeting Info.:Charlotte, North Carolina: January 24-26, 2005
Source:Proceedings of the 58th Annual Meeting of the Southern Weed Science Society. Vol. 58, 2005, p. 116.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Application methods; Conversion; Herbicide evaluation; Herbicide injury; Runoff water; Sulfonylurea herbicides
Abstract/Contents:"Increased use of sulfonylurea herbicides in managed turfgrass has lead to concerns over down-slope movement in watershed and injury to neighboring sensitive turfgrass. Studies were conducted in Blacksburg, VA at the Turfgrass Research Center and Charlottesville, VA on a fairway at Farmington Country Club on overseeded bermudagrass (Cynodon dactylon) maintained at 1.5 cm to evaluate injury to perennial ryegrass (Lolium perenne) down slope of plots treated with transition-assisting herbicides. 'Vamont' bermudagrass was overseeded with 'Prosport' perennial ryegrass in Blacksburg and 'Transist' intermediate ryegrass in Charlottesville. Randomized complete block trials with three replications were initiated on June 24, 2003 in Blacksburg and May 18, 2004 in Charlottesville. One by four meter plots were treated with flazasulfuron (flazasulfuron 25DF) at 0.0078, 0.023, and 0.047 lb ai/A, metsulfuron (Manor™) at 0.019 lb ai/A, pronamide (Kerb™) at 0.5 and 1.0 lb ai/A, rimsulfuron (Tranxit™) at 0.016 lb ai/A, and trifloxysulfuron (Monument) at 0.014 and 0.028 lb ai/A. Each plot was oriented such that sideward slope was less than 1% and down slope was between 7 and 11%. At application, soil was between 19 and 24% moisture at Blacksburg, VA in 2003 and between 28 and 38% moisture in Charlottesville, VA in 2004. Treated plots were allowed to dry for 2 hours at each location and irrigation was applied over a period of 8 hours with repeated passes of walking irrigators at Blacksburg and over 6 hours with Toro sprinkler heads for the first 30 minutes followed by a natural rainfall event at Charlottesville. Containers were placed at the top edge of each plot during irrigation or rainfall and plots received between 50 and 70 mm of water on all plots at both locations. Perennial ryegrass injury was visually estimated at 0 to 15, 15 to 30, and 30 to 45 cm below treated plots. In addition, the distance of perceived perennial ryegrass injury below treated plots was measured. Data were subjected to ANOVA and means were separated using Fisher's Protected LSD at P=0.05. Only trifloxysulfuron and pronamide injured perennial ryegrass appreciably in 2003 while all herbicides showed evidence of mobility in the first 0.5 meters in 2004. In 2003, trifloxysulfuron injured perennial ryegrass 23% or less in the first 15 cm below the treated plot while pronamide injured ryegrass 50% or greater between 0 and 45 cm below treated plots. In 2004, trifloxysulfuron and pronamide injured perennial ryegrass at least 80% up to 45 cm below treated plots while metsulfuron and rimsulfuron injured perennial ryegrass less than 50% between 15 and 45 cm below plots. However, rimsulfuron and metsulfuron did not injure perennial ryegrass at distances greater than 45 cm in either study while trifloxysulfuron injured perennial ryegrass at 1 meter or less compared to pronamide, which injured perennial ryegrass 3 to 4 meters below treated plots. In a separate study, flazasulfuron injured perennial ryegrass at 2.0, 2.25, and 5.1 meters below plots treated at 0.0078, 0.023, and 0.047 lb ai/A, respectively. By comparison, trifloxysulfuron at 0.014 lb ai/A and pronamide at 1.0 lb ai/A injured perennial ryegrass at 1.25 and 3.25 meters below treated plots, respectively. Thus, mobility of sulfonylurea herbicides seems rate dependent and is more likely on saturated soils. Although sulfonylurea herbicides are prone to down slope movement, they do not seem to cause turfgrass injury as far down slope as pronamide when used at recommended rates."
Language:English
References:0
Note:"The changing world of weed science"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Askew, S. D., J. B. Willis, D. B. Ricker, and M. D. Grove. 2005. Lateral mobility of transition-assisting herbicides via runoff water. South. Weed Sci. Soc. Proc. 58:p. 116.
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http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=191
    Last checked: 07/18/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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