Full TGIF Record # 225569
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=203
    Last checked: 07/24/2013
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Publication Type:
i
Report
Author(s):Willis, J. B.; Goddard, M. J.; Askew, S. D.; Keese, R. J.
Author Affiliation:Willis, Goddard and Askew: Virginia Tech, Blacksburg, VA; Keese: Syngenta Professional Products, Greensboro, NC
Title:Assessment of mesotrione lateral relocation via mower tires
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. 105.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Dislodgeable residues; Herbicide injury; Herbicides; Mesotrione; Non-target effects; Surface runoff
Abstract/Contents:"Mesotrione will be the first HPPD inhibitor registered in turfgrass, and has several positive attributes for use in cool season turf. Mesotrione is active on creeping bentgrass, bermudagrass, and several other weeds. Mesotrione applications to labeled cool-season turf species can potentially injure sensitive species when mowers traverse the treated area and then sensitive turfgrass. This is called tracking. The ability of herbicides to dislodge is increased with the presence of dew. Since golf courses often use cool season grasses in close proximity to desirable creeping bentgrass and bermudagrass, off target movement and lateral relocation is a concern. The objectives of this research are to determine potential of mesotrione to injure creeping bentgrass and bermudagrass when laterally relocated via mower tires and to determine effects of tracking timing and dew presence on injury from tracked mesotrione Four field studies were conducted in Blacksburg, VA in 2006 and 2007. Experimental design was randomized complete block, with three replications for each trial. Mesotrione at 0, 4, or 8 fl oz/A was applied to cool-season turf adjacent to creeping bentgrass and common bermudagrass. The plots were tracked at 3 timings; 1, 3, and 24 HAT (hours after treatment). Six by six ft perennial ryegrass plots were treated, and at the specified time, a triplex-greens mower was driven through the treated plot and across a 6 by 12 ft plot of bentgrass or bermudagrass. The 1 hr tracking timing was preformed with unirrigated turfgrass while the 3 and 24 HAT 0.2 inch of irrigation were applied to treated plots immediately prior to tracking. Results from trials conducted in 2006 found that tracked mesotrione did not injure creeping bentgrass regardless of mesotrione rate, tracking timing, or presence of dew. These trials were initiated in early and late August, respectively, and weather conditions at that time were hot and dry. Supplemental irrigation was used to maintain high turf quality, but growing conditions for creeping bentgrass was not optimal. These results and other experiments at Virginia Tech indicate that injury to creeping bentgrass from tracked mesotrione is more likely during optimal growing conditions. In 2007, mesotrione applications at 8 fl oz/A tracked 1 HAT and 3 HAT with 0.2 inches of irrigation significantly injured bentgrass between 12 and 13%, respectively, 3 ft from the treated plot and injury decreased in severity as the mower moved away from the plot. While injury levels in tracks are low, the contrasting differences in turf color is unacceptable, reducing turf color between 1 and 2 points on a 1-9 scale. Another trial was conducted with bermudagrass fairway turf, unfortunately a significant thundershower caused the trial data to be unusable. Mesotrione has potential to dislodge, laterally relocate, and injure sensitive species. Injury from tracked mesotrione is dependent on several factors. We believe that the following factors positively influence tracking injury from mesotrione; optimal growing conditions of susceptible turfgrass species, presence of dew, higher mesotrione application rates, and tracking soon after mesotrione application. Limiting traffic and irrigating after application but before traffic would likely reduce potential for mesotrione to track and injure susceptible turf species."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Willis, J. B., M. J. Goddard, S. D. Askew, and R. J. Keese. 2008. Assessment of mesotrione lateral relocation via mower tires. South. Weed Sci. Soc. Proc. 61:p. 105.
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http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=203
    Last checked: 07/24/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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