Full TGIF Record # 224616
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Web URL(s):http://www.newss.org/proceedings/proceedings_2008.pdf#page=36
    Last checked: 07/15/2013
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Publication Type:
i
Report
Author(s):Jester, J. L.; Willis, J. B.; Askew, S. D.
Author Affiliation:Virginia Tech, Blacksburg
Title:A six-year comparison of preemergence crabgrass control with professional turf herbicides
Section:Research posters
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Meeting Info.:Philadelphia, Pennsylvania: January 7-10, 2008
Source:Proceedings of the Sixty-Second Annual Meeting of the Northeastern Weed Science Society. Vol. 62, 2008, p. 18.
Publishing Information:Baltimore, Maryland: Northeastern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Application timing; Crabgrass control; Digitaria ischaemum; Herbicide efficacy; Herbicide evaluation; Preemergence weed control
Abstract/Contents:"Crabgrass remains the most important weed of improved turfgrass based on dollars spent for preemergence and postemergence control. Despite numerous herbicides available for crabgrass control in lawns, lawn care professionals and home owners continue to report control failures. Professionals are particularly interested in crabgrass control programs that provide season-long control and consistency from one site to another and across seasons. Several preemergence herbicides have been evaluated at Virginia Tech annually between 2002 and 2007. The objectives are to determine herbicide effectiveness and application intervals that will provide Smooth crabgrassthe most consistent smooth crabgrass (Digitaria ischaemum) control late in the season. Field trials were conducted each year for six years on tall fescue or Kentucky bluegrass turf maintained at 2.5 inches in Blacksburg, VA. Studies were conducted as randomized complete block factorial designs with treatments replicated three times. Treatment factors included herbicide and application with 6 herbicides each applied once at a full rate or twice at reduced rates. A nontreated control was included for comparison. Herbicides included benefin at 1. 5 lb ai/A and 1.5 followed by (fb) 1.5 lb ai/A, benefin plus trifluralin at 2.0 lb ai/A and 1.5 fb 1.5 lb ai/A, dithiopyr at 0.5 lb ai/A and 0.25 fb 0.25 lb ai/A, oxadiazon at 4.0 lb ai/A and 2.0 fb 2.0 lb ai/A, pendimethalin at 3.0 lb ai/A and 1.5 fb 1.5 lb ai/A, and prodiamine at 0.94 lb ai/A and 0.66 fb 0.66 lb ai/A. Initial treatment times were based on GDD50 between 70 and 140 and occurred between April 4th and April 27th depending on year. Repeat treatments were applied approximately eight weeks later and occurred between May 26 and June 7 depending on year. Crabgrass control was evaluated by visual estimation of crabgrass cover and percentage reduction in crabgrass compared to nontreated controls. In annual studies between 2002 and 2007, dithiopyr, pendimethalin, and prodiamine controlled smooth crabgrass between 80 and 100% when applied as two split-rate treatments and between 50 and 100% when applied as a single full-rate treatment with few exceptions. Consistency of weed control increased when sequential treatments were appliedcom pared to single treatments for all herbicides except oxadiazon. In general, single applications performed better in years of limited rainfall and poorly in years of adequate or excessive rainfall. Benefin and benefin plus trifluralin controlled crabgrass less than dithiopyr, pendimethalin, and prodiamine in most years."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Jester, J. L., J. B. Willis, and S. D. Askew. 2008. A six-year comparison of preemergence crabgrass control with professional turf herbicides. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 62:p. 18.
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http://www.newss.org/proceedings/proceedings_2008.pdf#page=36
    Last checked: 07/15/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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